At 19 years old, I am now a sophomore in college, but I've collected a pretty rich knowledge of everything about Apple computers in the last seven years. It's my hobby and business to buy broken Apple computers (mainly laptops) and refurbish them for reselling. I started a long time ago in junior high with my 1999 Lombard PowerBook G3 when iFixit.com was pbfixit.com! It's been a blast teaching myself through experience the Jedi ways of troubleshooting Apples. If one thing's for certain, it's that learning is constant. You can never know everything about Apple computers.
I recently got hired as a troubleshooter (board testing and repair) for R2Sonic, and it's been an incredible educational process as well. Hopefully some day, I'll be repairing Apple logic boards with little hassle. I'm pretty darn close to that now!
We should all meet our challenges with excitement and confidence. That's what drives me, and I love it!
By the way, you can check out the website my brother and I have made. I post most of my Apple projects on it! My brother's the one responsible for my profile picture. :) JamesGilbert Productions
[Although, this website will probably not be around much longer as Apple is discontinuing both iDisk and iWeb.] <Shaking my fist at Steve Jobs>