The best you can upgrade to is a Core Duo T2250 (1.73 GHz) or a Core Solo T1350 (1.86 GHz). You would really only notice a difference in gaming or video or sound editing. IMO it is probably not worth it.
It will probably not be too hard. You will most likely have to remove all the bottom panels and remove the hard disk to take off the main bottom panel, and then once that is off, access to the CPU should be fairly easy. If you are having trouble multitasking, increasing your RAM to 1 GB will help a lot.
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