I replace all my own bearings. It's not that hard. If you hit a snag there are lots of us who can help guide you. Stick swears by replacing with ceramic bearings which I think are good for 40,000 rpm. The bearings that come on routers aren't really rated for the rpm they turn over a long period of time. I'm sure Stick has a source for them.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.