Don’t worry so much about learning how to shift. The MSF BRC is supposed to be for people who have never been on a motorcycle before. I don’t drive a manual transmission car and I had no motorcycle experience (except being a passenger), but I was able to pick up the controls on the bike in class enough to pass on the first go. The school I took my class with recommended that we wait till after we took the class to get a bike. It is easier to learn things the right way first then to have to unlearn bad habits. The class was tons of fun…just relax and have a good time 
Good Luck!
