Install/Replace additional RAM on PowerBook 12” (PB G4 12”, PB G4 12” DVI)
Difficulty level: easy

Remove keyboard on a PowerBook 12” (PB G4 12”, PB G4 12” DVI)
Difficulty level: medium

Replace the Hard Drive of a PowerBook 12” (PB G4 12”, PB G4 12” DVI)
Difficulty level: medium-high
Please note: this operation can void warranty.

iBook and PowerBook Power Jack and Power Supply
Power supply and power supply jack pinout

Replace the Hard Drive of a PowerBook 17” (PB G4 17”, y2005)
Difficulty level: medium-high
Please note: this operation would void warranty (but with this model warranty is already over)