Mick Jagger says that people ask him all the time, "How do you remember all those words?" and he always replies, "It's easy. I wrote them."
I've never found that to be very helpful. I have a long history of needing the lyrics to our songs written in big Sharpie marker down at my feet during shows. Last week at an outdoor show the cheat sheets to "My Pre-Existing Conditions" blew away and Kevin the Merch Man had to chase them down. (His Christmas bonus this year is going to be either a four wheeler or a rocket jet-pack.)
So I've been practicing and reciting these words for a few days, there's a heap of them, and I'm just a line or two away from totally nailing it.
I'm pretty sure that if I gave up the Diet Coke, this situation would improve.