The most helpful bit of editing advice I ever got was from poet Michele Glazer. She said, "revision IS writing." In other words, there's no difference between the "writing" process and the editing process. You don't just write a draft, make some changes, correct the spelling, and call it good. As a writer, you need to be open to new ideas that may occur during the revision process, and be brave enough to follow them — thus, leading you back into a writing mode. See? Revision IS writing, so it's best to just accept that fact upfront.
There are many types of workshops, but none are quite as useful at honing a novelist's natural voice as a read aloud and critique workshop.