Heat the bearing in the oven for about 10-15 minutes, and then you can tap it into place. I think I heated mine at about 350 degrees. I have had somone tell me that they laid their bearings on a red hot stove eye for about 20 seconds, then installed. But I think this would be too much heat, and not evenly distributed, which may cause warpage.
DISCLAIMER: This is how I installed mine. This did not come from a Haynes manual or anything else. I'm sure someone will chime in if they see a problem with this method. It did work for me.