Rear bearings can easily be removed with a drift and hammer rather than resorting to a press. The new bearings can be similarily be drifted in, initially use the outer rim of the old bearing, then finish with a soft brass drift. The grease seals can carefully be tapped in. Be careful not to tap the seals in too far.
I made the mistake of replacing 50k mile original bearings for no good reason other than the mileage, only to be supplied with faulty bearings (apparently a faulty batch)that failed within 8 k miles that destroyed the bearing carrier and damaged the driveshaft......if they are working ok and no evidence of wear I'd leave them alone.
Edited to add... Roger the bearing failure was catastrophic, and I was luck not to have ended up in the hedge
Malcolm
Edited by - Englishmaninwales on 3 Feb 2009 23:51:44