Hi. I just got my first two Macs, a G4 desktop and a G4 iBook, both used but still very functional. My question is this: How difficult is it to install OS X fresh on a system? I want to clear off the hard drive completely and start with a fresh operating system. How is this done on a Mac? I have both the iBook and the desktop to do this with. Can anyone tell me how it's done and if I need anything more than just the OS X disc? Thanks.