By the time you will take the class (August), you will have gained a bit of knowledge and skill. By then, you should have some specific questions to ask the mechanics, and they will be glad to help you with the questions. At the REI store where I work, ust about everyone who takes the free intro class and the paid advanced class (you work on your own bike in the shop) comes away pretty stoked and happy with the experience. I'm sure you'll learn something. Have fun, and ask a few questions.