Some sources for iBook disassembly guides
http://www.phototropic.co.uk/ibook/
http://uk.geocities.com/ibookupgrade/
http://www.yourmaui.com/ibook.html
http://www.pbfixit.com/Guide/50.0.0.html
or
http://forums.xlr8yourmac.com/drivedb/search.drivedb.lasso
where you may find some of the same, or even some different links to online guides. The Apple iBook service manual is also handy, if you can find it
Maybe some of these guides are for optical drive replcaement or for slightly different iBook models, but you must basically get down to exposing the HD and CD/DVD drive in order to replace one or both of them, and most non-clamshell iBooks are very similar internally.
I did my combo drive and whilst it was a bit scary it went without problems. Took the best part of a day though.
Some tips:
- Use an old credit card or something plastic to open the outer casing. Metal objects will foul the case edges a bit.
- Use a few egg boxes or ice cude trays to keep the screws separate. There are a lot of different shapes. One or two of these guides have screw info sheets which are very helpful.
- draw / write down what you see and do. It is easy to forget 4 hours after you removed a screw where it goes back
I know you / your friend may not want to spend too much more than what the iBook was bought for, but it might be worth while seeing if you can pick
a combo drive cheap on eBay. Any Toshiba SD-R20XX drive should work, as well as a few others.
Have fun with your new(ish) baby.
And to beat the dead horse of Tiger on a G3, I use it and it is fine. But it likes RAM, especially the more widgets you use. Not everyone is a design pro / opens huge image files on their Mac. Some people just want to do basic stuff and for that pretty much any G3 will do, as long as it isn't terribly crippled in the RAM department.