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.

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.
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.
Fiction writers may want to join a writers group or workshop to benefit from the help of others who have experience with your genre and can help you develop your craft, challenge flaws in your narrative or character development, and help you improve the overall quality of your story. A flawed plot or character is much harder to revise after you finish writing your book, so it’s important to catch such problematic aspects of your book early on.
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Next, I check their work history to see what kind of projects they have been working on. For example, if I’m hiring an editor and I see that 8 out of their last 10 projects had nothing to do with editing, I will probably pass because it means they either don’t enjoy editing work or they aren’t able to find enough of it on Upwork, which should not be a problem for a highly skilled editor.

I cannot speak for all editors, of course, but I know I and many of us would be open to editing just part of your book at first, say, a particular chapter or two that you sense needs a lot of work. That is often enough to show you mechanical errors that you tend to make repeatedly. You can then go through the entire manuscript yourself looking for as many of the same kind of errors as possible. You will sharpen your basic writing skills in the process, and it will pay off in all future projects.