I know that Oswald killed Kennedy. Now, was he pushed? Encouraged to do it by outsiders? Possibly. Possibly. Was he sitting down with Fidel Castro? No.
You write by sitting down and writing. There's no particular time or place—you suit yourself, your nature. How one works, assuming he's disciplined, doesn't matter.
I'm terrified of walking into a room full of people. Sitting down at a dinner table with 15 strangers brings me out in a sweat.
Even if you don't feel like sitting down to write or working on that big proposal, or whatever it is, just show up anyhow and the rest will follow.
I think I am becoming obsessive-compulsive. David Beckham apparently turns all the Diet Coke cans in his fridge to face the same way every morning, and I nerdily sharpen all the pencils in my pot before sitting down to work.
I feel confident writing on my feet with improv, but it's different when you're sitting down and writing it out.