My 12" Powerbook is now out of warranty and want to upgrade the hard drive. Has anyone done this upgrade? If so what issues do I need to watch out for. I have already gone over the step by step instructions posted on iFixit and don't foresee any issues, but thought I would check to see if anyone here has any experience with this upgrade. I was considering a new MacBook Pro but I and going back to school soon and am feeling frugal. For the 500 bucks I could sell this machine for I rather try squeeze some more life out of it.