I have a Ti867 and installed memory chip myself but got scared of taking off bottom to install airport card so i went to apple store and had them do the card. Memory just goes under keyboard, Super easy to do. Same with iBook. I installed memory in my daughters iBook too. Apple web site has instructions with how to do pics. I have heard that Tibooks are sensitive to type of memory and don't like, respond well, to cheap/generic memory, so you might keep that in mind. I am looking to get a 512 chip upgrade myself now that I am learning photoshop (yikes) so please post if you find a good deal on decent brand of memory. the high end brand that everybody recommends is crucial but quite pricey. I bought my memory from microcenter, kingston brand, I think and it works fine. just my 2cents TmB