Experience: Experience, including internships at publishing houses and work in other media—such as newspaper or magazine editing—also is important for prospective book editors. Moreover, connections in the publishing world, whether to another editor or successful writer, also can help your chances of landing a job as a book editor. If you are interested in editing books that deal with a specific subject, such as fashion or food, you should have formal training or work experience in that area to increase your chances of getting hired. To grow your network, you can join professional organizations such as the Editorial Freelancers Association (EFA).
Excellent advice, Teymour. I’ll add this food for thought if I may… ANYONE CAN WRITE. Few people write well. Even fewer can tell a good story. IF YOU CAN TELL A GOOD STORY, and you’ve been working on a book but your writing skills are a little rusty, you need an editor who actually cares about your success, who cares about making your book the very best it’s capable of being. That usually takes an editor who instinctively goes above and beyond what’s expected. Every single author, every single story is unique. Each deserves the undivided attention of the editor.… Read more »
If however the editor is going to disassemble the book act by act, scene by scene, beat by beat, and show technically in story structure terms what needs to be changed, then the editor is spending far more time in analysis and constructing the demonstration of such to the client. Of course, this really depends on what service a client wants as well.
Check out freelance websites like UpWorkor even a great site called Scribendi. (Warning: if you source an editor from these sites, make sure you hire another, professional editor to go over it afterward. There is no way to know what you are getting otherwise. Just because the draft comes back better than it was before, does not mean it was well-edited!)
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.