If you are saying that you need to replace the palmrest, which holds the keyboard, then it really is not that hard to do. Follow the instructions and keep track of all the screws, take your time and you should be fine.
I actually did one of the tougher ones, which is to get to the optical drive of the 12" powerbook. It took a heck of a long time, but I felt such a major accomplishment afterwards.
Good Luck!