ifixit has the repair guide for the Powerbook G4 12" [http://www.ifixit.com/Guide/Repair/Installing-PowerBook-G4-Aluminum-12-Inch-867-MHz-Optical-Drive/215/1|here]
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you can also find the replacement parts on this site.
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you can also find the replacement parts on this site. I've replaced the optical drive on this same particular model and although it involves many steps, it's not overly difficult, IMO. good luck
ifixit has the repair guide for the Powerbook G4 12" [http://www.ifixit.com/Guide/Repair/Installing-PowerBook-G4-Aluminum-12-Inch-867-MHz-Optical-Drive/215/1|here]
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you can also find the replacement parts on this site.
ifixit has the repair guide for this Powerbook [http://www.ifixit.com/Guide/Repair/Installing-PowerBook-G4-Aluminum-12-Inch-867-MHz-Optical-Drive/215/1|here]
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ifixit has the repair guide for the Powerbook G4 12" [http://www.ifixit.com/Guide/Repair/Installing-PowerBook-G4-Aluminum-12-Inch-867-MHz-Optical-Drive/215/1|here]
ifixit has the repair guide for this Powerbook [http://www.ifixit.com/Guide/Repair/Installing-PowerBook-G4-Aluminum-12-Inch-867-MHz-Optical-Drive/215/1|here]