on Jane Friedman site:
As an independent developmental/substantive editor, I field a lot of the same questions every day. What is an editor? What do book editors do? How do I find one? How do I hire one?
The questions make sense—like book editing itself, an understanding of the editorial process happens almost exclusively in private author-editor interactions, and the specifics are rarely transferable between writers or projects. What’s an author to do?
For anyone embarking on a search for your first, next, or best editor, may this article be your comprehensive guide.