Seriously difficult. The process involved in attaching it is an oven which melts all of the solder at once. To remove the solder, you will need a special iron and then it can still be tricky. The laptop versions of the C2D are also very expensive. There is a couple of companies that replace G4s with faster ones in the old models, I wonder if they could do a one-off for ya. Sonnet and Daystar both do it, but you will probably have better luck with Daystar as they have a smaller operation.
My advice is still to sell you Book and buy a new one. If you decide to go for the mod though, post your progress to let us know how it goes.
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