I've a one-on-one hands-on class scheduled with the head mechanic of my LBS on Saturday. The first thing I am going to ask him to do is to show me how to change the inner tube. I am already comfortable with airing my tires, and have learned the hard way what to do with a fallen chain

I would like to get full benefit of his time. I am going to ask him to walk me through taking the rear wheel off - the gears have me nervous and am unsure how to deal with that. What else should I ask him about?

We will also do a 2 hour bike fitting - and I am curious about what will take so long. I believe that a computer and trainer is involved, and I've been told to bring my cycling clothes and shoes. Not a bad way to spend a Saturday morning, before he is done with me I should know a lot more about my bike