On a good night, I'm just into the flow and seeing the pictures and words in my mind clearly before I say them. On a bad night, which to be honest are nowhere near as bad as when I was starting out, I just concentrate on performing the routines correctly. I focus on my delivery.
I have no advice for anybody; except to, you know, be awake enough to see where you are at any given time, and how that is beautiful, and has poetry inside. Even places you hate.