Stop mythologizing the writing process. We don’t sit moodily in quiet corners waiting for the muse to whisper secrets to us. We don’t need to wear lucky socks or write in the dead of night or anything else that places affectation before productivity. Get your butt in a chair and write. If it comes out weak or bad or clunky or ordinary, then accept that this happens to everyone. Everyone. Get it down, get it done, and fix it in the rewrite.
It is so easy to get stuck thinking it needs to be perfect!
You can read more of his advice here.