Procrastination. That is the biggest bugaboo under my bed. (The second largest is dust bunnies) There are an infinite number of things to do instead of write. Video games, web browsing, having a social life; even reading can keep me away from writing. (And away from catching my bus, thank you very much Aaron Dembski-Bowden)
I came to self-disclipline late in life. I can't think of anything more important to writing or to life in general. It is a war that has no ending. I have to fight it every day and to be honest, I haven't done a very good job of it. I've more or less taken two months off from writing in the past tweleve. And that doesn't even count the weekends wasted.
So, in honor of Walter Mosley's simple advice, I'm going to try very hard to write at least two hours every day or 14 hours a week. That sounds like a small, reasonable goal.