Well, you KNOW I'm behind ya'!!! :D
Don't worry about the class either--I'm sure you'll be fine. I taught a class on online auctions in a corporate setting and although I knew a lot going in, my biggest worry was whether or not I'd be able to answer any questions that they had.
I not only did it but I kicked butt too!
You'll be fine. Deep breaths and lots of chocolate--that will get you through!!!!