For anyone writing non-fiction, I would highly recommend the book "on writing well" by William Zinsser, who also stresses the importance of editing relentlessly your draft.
- Building the writing habit of words on a page and how you make that happen.
- Being comfortable removing all of the words that are unnecessary through the editing process.
I knew I crossed the bridge when I found myself editing my own work and saying: "this is an incredible sentence, but it's not the right one here, axe it."
It's funny, editing has always been my favorite part of writing. It's when all of my favorite bits typically get written.