I asked an Apple tech, and he said he could do it. I too was impatient and ignorant and didn't get one with bluetooth. I'm not too tech savy and didn't really know what bluetooth was good for. I would love a wireless mouse, and I'm not going with a dongle.
The parts list and labour came to $150 CDN (as opposed to $65 if I ordered it with it), so I'm not going to do it until I put in a super drive and larger hard drive, so he only has to take it apart once.
Unless you know what you are doing (I don't), I wouldn't even think of doing it myself. I'm a pretty good diy-er, but I gotta draw the line. i managed to wreck the airport antenna just putting in RAM. Hammer-hands.