I can't tell if Toby meant to post the question about the difficulty of regularity of Writes or not. I like Donna's analogy of being the first couple on the dance floor.
I can only say that what often sets me free in a Write is remembering that I am or can be the only listener. (Dancing with myself?) Often I have to write a sentence saying that. It's hard to remember what I mean by that, or why it means so much to me, when I'm not actually in the midst of a Write.
Maybe also, it's a struggle every time for me to believe there's anything in there that I don't know already, that doesn't bore me silly, irritate me, or strike me as shallow.