I have a toshiba A200 with the dreaded 3945abg and I was wondering how hard it was to change the actual built in card (switch on the case and everything) and if it's worth my time? I don't have anything to test my card slot or I would try that, I just don't want to take the risk if it may not work >.<

Never worked on a Toshiba before, but my Lenovo you need to open the case and remove the keyboard, and the card sits just under the keyboard. I think the same case might have applied to my Dell, but it has been a few years since I did that one. It's not hard, just pay attention to the order you remove things and don't drop any screws ;P they get lost easy. (trust me)

Toshiba's website should have a service manual on there, telling you exactly where your miniPCI card is and how to get to it. First place I would look.