I have a MBP from 2007, with a 160gb hard drive. I'm very tempted to upgrade it to a 500 or 640gb hard drive. I was ready to do so, but then a friend of mine spooked me about doing it myself, by telling me a story about another friend of his who fried his computer trying. I've checked out the legalities. While changing the HDD won't void the warranty, if you damage something while doing so, applecare won't pay to repair it. So, I'd like to ask all you fine people who have swapped hard drives in old MBPs, how risky is it? Am I being paranoid, or is there actually a substantial risk of damaging your computer by changing the hdd?