Hey Barb,
The best way to learn is to try. I've done almost everything to my bike except the headset which I let the LBS do because you need special tools. You can always take it to the LBS and have them go over the bike after you've tinkered if you don't feel sure. My guys don't mind and it beats waiting for your bike for a week especially during their busy season. I have Zinn and the art of Road bike Maintenance, The Haynes Bicycle Book and Road bike Maintenance by Rob Van der Plas. Between all three and the pictures you can pretty much do anything. Also, Parktool.com has a great section on line.
Good luck.