I just got a new Hd today (Hitachi Travelstar 500GB) and looking for info on replacing it myself. I hear it isnt to hard to do it yourself. I have a macbook purchased on release from March 2008. I am running Snow Leopard but cant find the CD which I purchased. I was wondering if you can "clone" existing HD without having the Snow Leopard CD. Is there a site with set by set instructions? Do I need to purchased SuperDuper software?