Don't cross out. (That is editing as you write. Even if you write something you didn't mean to write, leave it.) Don't worry about spelling, punctuation, grammar. (Don't even care about staying within the margins and lines on the page.) Lose control. Don't think. Don't get logical. Go for the jugular. (If something comes up in your writing that is scary or naked, dive right into it. It probably has lots of energy.)