3. Copyeditors usually come next. (Smaller publishers have cut out the copyeditors and expect the acquiring editors to function in both positions.)
Copyeditors are the techies who take over after you and your editor have polished the manuscript. They check for correct grammar, spelling, and punctuation. They point out inconsistencies and inaccuracies. Sometimes they rewrite an awkward sentence.
For my last few books, I've had two bad copyeditors. In both instances, they were new and still in the stage of proving themselves. One of the books Twila Belk and I wrote together was the worst. The copyeditor forgot the book was ours and her responsibility was to make it sound like us—only better. Instead, she eliminated contractions, reworded important sentences, and the style became stiff and very unlike us.
I appealed to the senior editor, who agreed, and they assigned an experienced copyeditor who did an excellent job.
Remind yourself that editors aren't the final word. It's a cooperative venture to put out the best product.