Unfortunately, no one can give the person who asked this question online the other day a specific, accurate answer without knowing more about what is required. Asking for a price to edit a 600-page manuscript is nowhere near enough information. With that said, here are a couple of points I suggested the author consider.
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First, I'm happy to see that you recognize your need for an editor for your work. No writer can know how to edit simply by having written a lot of words. Writing requires one skill-set (or, some would argue, no skill-set at all, but let's not get into that); editing requires another. Without learning what editing involves—and then learning what good editing entails—no one can sufficiently edit anything but the most rudimentary piece of writing with the hopes of improving its readability.
Second (and here's where things get dicey), few editors can do all types of editing. And editing does come in a plethora of flavors. Not butter brickle, unfortunately, but things that can be just as enticing, if less indulgent. Depending upon who's doing the defining, an editor can be a proofreader (checking for typographical errors and basic grammatical and punctuation mistakes). He can be a fact-checker, a copy editor (reviewing the author's copy for readability, proper syntax, and the like), a conceptual or substantive editor (also at times referred to as a content editor, checking a piece for various flaws in logic), or a developmental editor (reviewing how the story is put together and marking various recommendations from that point-of-view).
An editor can also be a structural editor (specializing in structural issues concerned with a story's readability and involving the use of flashbacks, flash-forwards, linear chronology, and even when and where to break a story into chapters and other divisions), a line editor (concentrating on the flow of the prose and pointing out any awkward phrasing, etc.), or any combination of the above. Read More