In doing all the bearings in my '97 220 this spring, the best/easiest method I found was to have the bearings in the freezer, and starting them in with a 6" bench vice. That way, you can get the bearings lined up properly by applying SLOW pressure with the vise. Once they're heading in straight, you can go like gangbusters pressing them in flush with the vise. Then, get the right sized socket, hold it against the bearing (on the outer race, of course!) and drive them home with the vise. I found that the even pressure from the vise was way better than pounding on them with a hammer. I also had a small ruler with millimeters on one side, and used that religiously to get the bearings to the specified distance from the edges. It's easy to press in a little at a time with the vise, stop, check the distance, and press more if needed. It took 2 people to do the first couple, but after that, I was able to do it by myself.
Granted, this method doesn't actually work for the wheel bearings, since you can't fit the wheel in a vise. However, I bought one of those workbenches from Sears that has a vise top (for holding wood, etc. while cutting) and that had enough strength to push the bearings in. That definitely takes 2 people, though.