You never know what you're going to get when you take a class. I've been in both good and bad classes. Just go with it and focus on learning not doing perfect work. Sometimes I just met some great people and heard some great stories.
Don't forget you are with other people who are also there to learn.
The block you are going to learn is great and I wish I could share it with you! Have fun.
bring old faithful! You want to be comfortable!
peace