Good for you. Get there early to set up your machine. Take the machine that you're most comfortable with and gives you the least amount of problems. Take everything with you that you normally use when quilting; seam ripper, clippers, extra machine needles, extra bobbin, extra thread. And most inportant sit in the front of the class; you want to get a much help from the instructor as you can and a clear view of what she's doing. But mostly don't be intimidated - if everyone else knew how to do the pattern they wouldn't be there.