Stick your straight pin directly in between the seal and outer race just enough to get a good grip. Then pry it straight up and out. Its very easy and does not damage the seal or bearing. These photos should help. To replace, simply press into place.
Ceramic bearings have the normal steel balls replaced by white ceramic balls.
The ceramic balls are made of solid silicon nitride . Ceramic silicon nitride balls are called ceramic but have nothing in common with house hold dish ceramics. They are called ceramic because it's easier calling them ceramic then silicon nitride. The ceramic silicon nitride ball is far smother, harder, lighter and stronger than one made off steel. The ceramic ball is lighter then the steel ball.