If you want a good review of how to service BB30, go to Park's website...an excellent resource for bike maintenance.
Bearings are pressed in place. Park sells a bearing press or you can make one out of threaded rod with fender washers to draw bearings into BB bores.
As discussed, they tap right out from the back side with a dowel and hammer. No need to use a press for removal. Service of BB30 is simple. In theory also less expensive. BB30's are cheap compared to DA BB's, square taper of years past etc.