Yes… I am in the midst of one. A novel,,,set in the mighty US Midwest. It’s taking waywayway longer than I ever thought, but it’s fun, too. So I can’t say I’ve attempted to write a book, I am, I hope, writing a book. I planned somewhat, to keep myself on track, but once you get going, the book/characters/story kind of take over. (If fiction)> I suggest taking time to ‘plan” the Big Worry—the awesome trouble the protagonists is wound up in. And its layers, how it plays out in scenes. Feather it out, so see the elements of the fatal flaw is its been called. Enjoy being you, finding what you are, as you write, even drafts.