I used a compartmented box to hold the screws and bits from each stage. I couldn't get the speaker and other 2 coloured cable disconnected but was careful with the upper case - kept the screen part of the case apple symbol down on the desk and lent the cables dangling case against the side of my Chromebook that I was viewing this "how to" on :-)
Thank you for this "how to" I have just finished re-assembling my G4 iBook having replaced its 60GB with an 80GB I had lying around - 20GB extra capacity will make a difference and the 60GB will be kept safe as a backup :-)
I used Carbon Copy Cloner to clone the 60GB (with the 80GB in a USB enclosure) before I did the swap.
I had previously dismantled a friend's old very broken G4 iBook to get the hard drive out for data transfer to his new macBook but not with instructions as reassembly was pointless as the power circuits were fried due to dropping from a great height.