When I did mine, I opened up the jaws on my bench vise, wrapped the cam in a shop rag, and closed the jaws until they just barely did not touch the cam. Then with the bearing resting on the top of jaws, I gave it a few medium strengh hits with a dead blow hammer. Once it was in too far for the dead clow to hit it, I used brass punch and gently tapped it out the rest of the way. Came out fine and didn't damage cam at all. Ofcourse using a hydrualic press is the way to go. I did this with my stock cam just to use it to install the inner cam bearing without risk of needles popping out, so I didn't care if I damaged it. I used the press to install the new bearing on my new cam. I would just replace the bearing with new. It's not that expensive.
