Installing a new hard drive in the MPB is NOT that difficult. As long as you have the right tools, you should be fine. I have swapped out a hard drive in the old G4 iBooks (which was a pain). I also have swapped out the old MBP Airport Card with a Mac Pro Airport Extreme card, which gives me 802.11n capabilities. Opening up the MPB using ifixit.com as a reference made opening it up a breeze (as compared to an iBook, bleh). That's my experience.