I understand your desire to over clock your iBook clamshell, In fact I just did mine. You would benefit from a "Take apart guide" so you should check this out:

http://www.ifixit.com/Guide/49.0.0.html

You should also check out the mod guides here on MacMod

Be aware, the resistors you will be moving are Really, really...really! small. If you drop one on the carpet, its gone forever.
Keep us posted on this, and ask as many questions as you like, thatís what this forum is for.
_________________________
Macbook 2.1 core duo 1gig 160gb sata
iMac g5 w/1 gig 160gig all-in-one and SWEET!
iBook G4 IGhz
Quicksilver Dual 800's
iPod touch
"Guys, I think we just lost the platform here" Pete Conrad
When in doubt, try SCE to AUX