Starting a new class tonight feeling a little nervous!

So last night I started Pilates was so nervous before going but I had a great time and have booked my next class for next week! Tonight I am going to try out a Trixter class which is apparently spinning but with handle bars that move! I used to cycle but haven't even looked at a bike in years, so I'm pretty nervous about getting started again!
I'm hoping that the class atmosphere will be similar to what last nights was, I don't know where the hour went last night I had so much fun!

What are your experiences with spinning,x-biking or trixter?

Emma