Writing helped to have jobs that involved running around, pushing things like dish carts and wheelbarrows. It would be hard to sit at a desk all day, and then come to sit at another desk. Also, it helps to abandon hope. If I sit at my computer, determined to write a New Yorker story I won't get beyond the first sentence. It's better to put no pressure on it. What would happen if I followed the previous sentence with this one, I'll think. If the eighth draft is torture, the first should be fun. At least if you're writing humor.