Has anyone done this? I'm really curious on the difficulty level. I may purchase one that definitely needs the drive replaced and I know for a fact that replacing the hard drive was quite the delicate procedure so I'm thinking this may be even more difficult. Please let me know if you've done this and how much of a pain it was. I'm afraid I may not be able to do it on my own..the last thing I want to do is break a machine that I just get. Any advice ASAP would be GREATLY appreciated.