I pre-write everything in my head, sentences and all, then in two 15 minute sprints, I blurt out a 1000 word chapter into google docs that is fully formed in my head!
I also just started listening to my novel played back to me via a robot reader that was shared with me, and it helps me catch so many repeat words, crutch phrases, and awkward bits of prose...Though listening to it read dirty scenes makes me cringe so hard I might die.