Revision is the final stage of the book journey, after the gathering of material and the forming of a rough draft, after the structuring that happens next. Revision is hard, but essential if you want to publish. And there are so many ways to go about it.
I think I've tried them all.
Some approaches to revision are so daunting, so discouraging. The worst one I've experienced is this: start with chapter 1 and go through the book, line by line. That is great for the final fine-tuning. But if you're trying to revise larger problems, such as structure, it'll bog you down in no time. Lots of writers come to me at this stage, saying how stuck they feel, how they hate their book, and how they want to give up. No wonder. I would too.