Before I learned how to work on bikes, I knew nothing about tools, parts, "how to" anything. Once I learned how to work on bikes, I became more confident to take on a whole new world of do-it-yourself projects--it is just plain empowering. Having been a shop mechanic and then owning my own shop, I now build custom bicycle frames. All from deciding one day to deal with my squeaky chain...The short is, learn how if you are curious and don't like relying on other folks--almost always guys--to help you out with your bike (and if you don't mind getting some grease under those nails). Get a good, updated repair manual (the Zinn books are good) and have patience. It is true that it is not very hard, once you learn the most basic mechanical principles (right tighty, lefty loosey stuff).
If you are really into learning bike mechanics thoroughly in a very supportive environment, you may want to check out United Bicycle Institute. They are very supportive of women getting into this and make it simple to learn!
They offer really good one week seminars.
