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Yikes. If you're planning to do it yourself and haven't done this sort of work before, get plenty of practice in on less precious boards than the A1200. Try removing and replacing the chips on an old network card, modem or similar. With the right tools and technique it's a relatively straightforward job, but there's a high risk of significant damage to the board if it's not done correctly. You'll need a hot air rework station, and ideally a suitably-sized PLCC nozzle at the minimum. For fitting the replacement chip, I prefer to use solder paste and a suitable stencil and hot air, but I know other people prefer to drag-solder with plenty of flux.
But if this isn't something you're competent with and you don't plan to get the correct tools and experience to be able to do it, I'd suggest bringing the board and chip to someone with the necessary gear and skills.
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