Will it create problems if I put a 7200 rpm drive in place where a 5400 rpm drive was (ie noise, vibrations)? I really think that the 500 GB Scorpio would be better than the one Apple gives since I'm sure all they do is just slap an Apple logo on it. But if I put in a new HD before I even turn on the new MBP, how does Leopard still install onto it? Is Leopard going to be on the 160 GB HD that comes with it, or somewhere else in the computer, or the packaging? Is it really easy to switch out for someone who's never done this before? You just unscrew it (what type of screwdriver?), detach the HD, and put in the new one, simple as that?