I miss my TiBook! Pretty straight forward, just lots of screws. This is for the DVI model, will be 867Mhz up (I think). There were two generations, DVI being the newer.

http://www.ifixit.com/Guide/Repair/Installing-PowerBook-G4-Titanium-DVI-Hard-Drive/89/1

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car