I plan to exchange my MBP for a MB (within 14 days), but I don't know if I need to clear everything off it first or if Apple will do that for me? I would do it myself right now but I'm not 100% sure if I am going to make the exchange yet. Also will the person at Apple do it in front of me? I don't know if I'd feel comfortable with them just walking off with it and all my personal stuff on it still