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This is not an easy thing to do. What model iBook do you have? I have repared the power jack on an old clamshell iBook before (simply resoldered a broken solder joint). I can't really give instructions though - I just kept taking it to bits till I got the the power socket section. Ended up with about 30 pieces not including the screws!
 
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.
 
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