It is easy. I sold my old 6400/200 to a buddy and we took out the old modem which required this. There are about 5 screws you need to remove to slide out the whole enchilada. This motherboard slides in and out of the case by way of a track, so when you replace it make sure you line it up right. Also, remember to hit the little reset button on the motherboard before you put it back in. One of the forums somewhere actually had diagrams and photos of this process. If I find it I will post it. Good luck!