I'm a full-time believer in writing habits, pedestrian as it all may sound. You may be able to do without them if you have genius but most of us only have talent and this is simply something that has to be assisted all the time by physical and mental habits or it dries up and blows away. I see it happen all the time. Of course, you have to make your habits in this conform to what you can do. I write only about two hours every day because that's all the energy I have, but I don't let anything interfere with those two hours, at the same time and the same place.