Writing fiction is for me a fraught business, an occasion of daily dread for at least the first half of the novel, and sometimes all the way through. The work process is totally different from writing nonfiction. You have to sit down every day and make it up.
I write entirely to find out what I'm thinking, what I'm looking at, what I see and what it means. What I want and what I fear.
Before I'd written movies, I never could do big set-piece scenes with a lot of different speakers - when you've got twelve people around a dinner table talking at cross purposes. I had always been impressed by other people's ability to do that.