The main thing to check is that the board supports the CPU, whether the chipset does or not, so you would need to check with dell or find someone that is using the same specs. Other than that you might have to upgrade the BIOS. If you have taken you laptop to bits before and you know you way around inside it then it shouldn't be too hard.
Hope this helps
Sorry man i have just seen this post, and just want to ask Have you finished soldering 956 balls on the board?
Actually these are embedded cpu's means directly soldered on the board and the one u are talking about is 956 balls micro fcbga type it has balls under it instead of pins and these balls are supposed to be soldered on the board.