When writing a book, the first thing I do is write down the idea that geeked me enough to think about taking on the project, make copies and tape it everywhere I'm likely to write (monitor, front of notebooks, etc). That way, when I'm deep in frustration and wondering why I'm struggling with this POS, my eye catches it and I can get all excited about the book again. And if I can't, that's a big hint about whether or not I should be writing it right now.
Then I get my world, characters, major conflicts firm in my mind. Usually I have a few snippets of dialogue or a scene bit or something that I'm really looking forward to writing down. Then I start writing. No outline (been there, done that, burned the t-shirt), nothing else, just an inciting event that changes the hero's world forever and start following the conflicts through the novel.
I'm also a slow writer because while I create fairly quickly, I go over every scene immediately (sometime before I finish writing it) and layer in all the things that don't come in the first heat of writing: extra description, emotional, subcontext, subplots, etc. When I'm finished with a scene, or a chapter, it's pretty much done except for line edits. As I'm writing, if I realize that something major has to be added back a few chapters, I do that immediately and rework the book through the ripple effect that change makes before I continue writing new stuff.
I've discovered, in all my years of doing this writing stuff, if I don't do all the work in the first flush of writing, I will never do it. Ever. My fun is in the creation of words (1st draft), not in the manipulation of words (any other draft), and if a novel is too flawed after I've finished the first draft, then I would rather scrap the whole thing and create an entirely new draft from the same idea than edit and rework the old one. I have over 10 drafts of the same novel concept as testament to this preference, as well as 7 books that are so badly flawed that I won't rewrite them (but now don't care about them to write another draft), so I just won't let the first draft get that bad again.
My second draft read-through/edit is to make sure that it tells the story I'd intended to tell and that each scene does its job within the scope of the story. Individual scenes might get rewritten, characters get tweaked and story arcs punched up, but there generally isn't much rewriting to do.
If I'm sending it out to beta readers, this is what they'll get, but that is an if. I don't always.
Final draft is to read the entire book aloud, preferrably to someone else but a recorder will do. If reading to someone else, we both have pens to note down what clunks, dialogue that doesn't flow right, etc. If recording it, I save the pen to the play back (yes, it is possible to get over hating the sound of your own recorded voice) and listen for the same clunks and problems and note them down. Then I correct all the errors, grammar books at my side.
Then I print up a clean copy and send it out. Done. Take a month or so off to refill the creative well and get excited about the next idea and repeat the process.
Good luck in finding a process that works for you.