This is a basic question but I was wondering if anyone could help me out on installing some more RAM in my computer. I have 512 and I was going to add an initial 512 into my 15" 1.5 ghz powerbook g4. I talked to someone at the apple store and he said that all I do is "open the bottom and slide it in". Can anyone be a little more specific because I don't want to mess anything up!! Thanks, any help is greatly appreciated!