First, decide whether your time or your money is worth more to you right now. You can greatly reduce the amount of money your project will cost by investing more time, and vice versa. If time is no object, you may want to spend some hours in the library reading style manuals and going through your manuscript with a fine-toothed comb so that when you do hire an editor, (s)he will be able to zip through it quickly. If you end up deciding that’s more effort than you want to invest, then you will at least find the monetary cost of hiring someone to do it for you a less bitter pill to swallow.

A copy editor or line editor focuses on improving sentences and grammar, as well as suggesting other ways of rephrasing ideas, and providing comment on anything else they pick up. Non-fiction books often use multiple styles, for example, chapter headings, sub-headings, action points, bullet points, call-outs and examples, so these will be examined at this phase.
The single most decisive factor should be the quality of the edit itself: Will this editor help improve your book? In order to assess this, nothing beats a sample edit (even if you have to pay for it). Testimonials and credentials (such as experience at a major NY publisher) can help you narrow your list, but you should submit the same sample to a variety of editors and compare their work side by side. Some editors will push too hard, and some won’t push hard enough; some will simply “get” your writing, while others will seem to speak another language entirely. In my experience, the editor’s résumé is far less revealing than the quality of the sample edit. In fact, the higher an editor’s pedigree, the more reluctant the editor might be to provide a sample edit. Don’t be afraid to insist: no one should expect you to invest in a car without a test drive!

If neither Sally nor myself feels quite right for you, then I suggest you browse the bookstore or even the public library for books published in the last few years that remind you in some way of yours. Check the Acknowledgments page to see if they thank an editor. If not, see if there is any information to contact the author and ask if they used a freelance editor and if so, would they recommend them.

Ebook Launch helped make my first self-publishing project a success. They responded promptly when I had questions prior to hiring them for a custom ebook cover and .mobi and .doc formatting. Their price was about half what was quoted by format and book cover freelancers, so I was pleased that I got my money's worth. They sent two book cover variations and we worked through suggestions to improve on one. My book cover design turned out great. I look forward to working with them again in the future.
Moreover, the casual distinction between a (developmental) “editor” and a “copyeditor” can be a bit simplistic, particularly in a self-publication or even vanity-publishing context. A self-published author may barely have the budget to hire one editor, so that editor needs to be able and willing to blur the lines between developmental editing and copyediting. The editor must also be accustomed to working with authors of a variety of strengths and weaknesses, including many whose work would not, in fact, have been accepted by a commercial publishing house in its current form. I have come to take great satisfaction in taking a new or newish author by the hand and helping them find ways of making their work the best it can be. Of necessity, this must include line-by-line correction of grammar and style (often a surprisingly great amount of such correction), but can rarely be limited to that.
– Many self-publishers need less specialization. I sought an editor — mostly a copy editor, but also this is the only person who could tell me if I ramble in a particular chapter. I couldn’t afford a full dev edit, but I think I’m typical in wanting an editor who will tell me what my friends wouldn’t, and maybe switch hats for small sections where it’s needed.

ROUND TWO: an in-depth, comprehensive, line-edit that includes rewriting sentences, improving word choice, organization, plotting and pacing. We’ll make the dialogue stronger and more believable, the action more tense and nail-biting, and the emotional peaks less melodramatic and cheesy. For non-fiction, we’ll strengthen your argument and make the writing more engaging.
The romantic myth of an author sitting alone in their room and emerging with a finished book is just that: a myth. Writing is a tough skill to master. Good books are the product of talent, craft, revision and more revision. Like all creative arts, writing requires critique from knowledgeable professionals who can make suggestions and provide direction from a perspective most writers can’t obtain on their own. From developmental editing — with advice on story and structure — to copy editing and proofreading, working with a range of book editors is absolutely crucial when writing a book. But where can you find the professionals with the right experience in your genre to take your story to the next level?
I’m sorry you had a bad experience on Fiverr. I feel like their cheerleader right now but I know there are some terrible sellers there … always have been. You can’t even always tell by the gig description because some sellers simply copy the description of someone else. But reviews do not lie. Hire someone with no fewer than 500 reviews, I would say, and all positive.
While you may (or may not) be correct in your assumptions, your tone in general is rude, and disrespectful. If you are indeed a true editor of distinct taste and experience, you should not feel the need to bad mouth others for their thoughts and opinions. Show a little decency, and realize that you are indeed speaking to a human being, who probably has thoughts and feelings, and is in my opinion, a much more intelligent human for having the intellect to not attack someone verbally for their thoughts. No one needs you to be rude, or asked you for that matter.
Attention to detail is a critical skill for editors. So how do you screen out editors who might not wield a virtual red pen with the chops to catch every typo, grammar problem, style issue, and the like? You could post a job ad for an editor and subtly screen out applicants that aren’t as detail-oriented by including some fine print in the description.
Thank you, Blake. I am past the point of undercooked. I’ve had beta readers, I’ve rewritten dozens of times, had an editor look over my MS twice, and believe I’m ready to take that leap. Unfortunately, and this wasn’t mentioned, most writers will never be satisfied with their work ‘as is’. I tinker and add. It’s difficult to find the balance between making it better, and messing with the core integrity. Even JK Rowlings is known to do this in her head when she’s reading one of her novels in front of an audience. This fear has held me back for years, despite my three years experience as a freelance writer for a local magazine. I’m scared I’ll miss a comma and it’ll be thrown in the slush pile.