I managed to follow this guide successfully and installed a new Hard disk. I already owned a set of tools: Draper brand - 31 piece precision screwdriver and bit set, which contains the necessary tools for this powerbook (not just the steps for this hard disk replacement guide). I did find, using this tool set, though, that my philips 00 head wore away a little and would not 'grip' the screw heads well. After a bit of panic, I tried the philips 0 head, and this worked just fine for all the philips screws. Hope that tip helps some others.
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