Hi! So, I want to get a new iMac, but with an SSD. Except, the price of it straight from Apple is too high. So, I wanna buy one from newegg and replace the internal hard drive in the iMac. How hard is it? Is it safe? Do I void the warranty? I mean, I know it's easy enough to add RAM to it, but I'm not sure about the HD. Maybe I'll buy the HD and bring the iMac to an Apple store and have them do it? Thanks!