iBook takeapart
Taking apart an iBook, clamshell or dual USB series sucks. I had no less than 30 screws on a dual USB series that I upgraded the hard drive on. Its best to take it to an apple service center to have them do it.
On the flip side though, if you had a PowerBook g3, that's a different story. Replacing anything on those are a breeze.
If you do decide to do it yourself, grab an ice cube tray for holding screws, and make copious notes. Also, there are screws hidden under the keyboard magnets.