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You need a good puller to pull the bearing off the crank as not much to grip behind the bearing and heat the cases up to drop the bearing in the crank cases I normally do that when I have the new bearing so, heat, drop the old bearings and put the new bearings in at the same time while hot and let the cases cool down, I do my and other Norton case over my wok burner on my gas stove, perfect for dropping bearings out then flip the case over and drop the new bearing in then do the other side case.

A lot shim the new bearing on the crank but I find Nortons don't mind a bit of end play.