I took a twelve hour course and learned a lot. The class was full of mountain bikers and one roadie (me), but nearly everything I learned was something I could apply. The course gave me the confidence to do most any work on my bike. Since then, I've changed out my cassette twice, upgraded my shifters and rear derailleurs, and known when to apply general maintenence and cleaning to keep the ride running smoothly. And oh yes, I've changed my tired and fixed my flats (and had to shoo away some well-meaning men when I did so...).

My DH just gave me a great bike tool kit for my birthday, too, so I'm set to rock and roll.