I have over 25 years of cumulative experience as a technical editor, proofreader and writer. In addition, I can add another 8 years to my resume acting as the head of a corporate word processing division and also as an administrative assistant. I am an expert in the use of MS Office (Word, Excel, Powerpoint, Outlook), Adobe Acrobat and equation entry/editing using Word and MathType. I have extensive experience formatting and laying-out text for publication.
I have heard so many horror stories about editors and experienced a few myself. If an author is uncertain about an editor, most editors will do one sample chapter or 10 pages (whichever comes first) for free to give the author an idea of their style. Edits can be very intense and I would encourage authors to listen if they keep hearing the same things about their work from different sources. That said, they also don’t need an editor who is so brutal they never want to pick up a pen again.
There are different levels of editing—developmental, copyediting, and proofreading. I’ve found that authors are often willing to pay good money for a developmental editor, someone who walks by their side and helps to shape the book, but when it comes to copyediting and proofreading, especially if and when an author has had a developmental editor, suspicion arises as to the value or merit of these more drilled-down types of edits. Don’t let this be a blind spot; they’re important—on par with a developmental edit for sure.
Even if you wrote the book in your free time, this is my day job. The per-project cost many new authors would consider “manageable” would, if broken into an hourly rate, end up paying editors less than minimum wage. They don’t intend to pay what someone could earn making french fries; they just greatly underestimate how much time must be invested in editing.
Regarding your last question, I know of no editor who gives a money-back guarantee for occasional errors that happen to slip through or for a different opinion by a later editor. I’m afraid such things are just the nature of the publishing beast. But by having a shorter portion edited first, you will get a decent feel for whether someone is the right editor for you, and will be able to be confident in his or her work on your entire book.
Having your manuscript reviewed by a professional book editor is a rewarding experience. In addition to the improvements to your manuscript, you will also benefit from the feedback on your writing that only a finely tuned professional editor can provide. Writers often comment on the lifelong benefits enjoyed from their very first editing experience. If a writer wants to ensure they are creating an impactful and enjoyable reading experience for their readers, then editing is a no-brainer. Remember nothing is more damaging to your author brand that publishing a book with embarrassing typos and grammatical errors. Read more.
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There seems to be something half-way between beta-reading and development editing. I think it’s right for many new writers — I’m just finishing my first book, and was not about to pay a real development editor, but beta readers weren’t engaged enough (especially friends unwilling to point out the negatives). But it this kind of editing doesn’t really have a clear name.
You draw distinctions that use idiosyncratic definitions of some fairly standard terms. For example, Chicago defines the terms “manuscript editing,” “line editing,” and “copyediting” as synonymous with each other, and none of them as synonymous with “mechanical editing,” although that is one element of them. Certainly, I agree that an author has a right to expect more than merely mechanical editing unless that is specifically what they have requested. However, I cannot agree that the only route into competent and appropriate freelance editing is internal employment within a publishing house, and that the only clients who should be counted as a relevant part of a freelance editor’s curriculum vitae are those who are traditionally published.
Open the book and start turning the pages until you see the title page. Some books will have a single blank page, while some will include marketing materials or quotes. Novels will often list an author’s other books. Turn pages until you find the title page, which will have the book’s title in large letters in the center or upper-portion of the page. Look underneath the author’s name at the bottom to see if there is an editor listed.
Every author must decide what is important to him or her in an editor, but in these days of electronic communication, honestly I do not think it is important to seek a local editor unless your book is specifically related to something of local interest. Even in that case, you may benefit from the perspective of someone who does not have all the local knowledge it can be easy to presume, so that you can prepare your book for a wider audience.