I have been editing now almost nonstop for about five years or so and I have come across the same issue many times. I tell writers not to rush their manuscript. What do I mean by that? Take your time to look over your manuscript many times, from a writer's point of view, a reader's point of view and the editor`s point of view. Do not be in a rush to send your manuscript to your new editor. Do that and you risk receiving an unexpectedly large bill from your editor. Take your time to edit your manuscript over and over. Let other people you know read your manuscript, giving you pointers. Let people you don't know read your manuscript. Rewrite and reedit, let them read it again until they are satisfied. Read it again slowly (pretend you're back in first grade and read one word at a time, touching each word with your finger and reading out loud) until you are satisfied that you've done everything possible to make your manuscript the best it can be. Now, and only now, should you send your manuscript to your editor, hopefully one that charges by the hour, not by the word. Be smart, do a great job and reap the benefit of a much lower bill at the end of the process, one that you can afford and be happy with.