If memory serves, there aren't sealed bearing hubs, but "sealed system". Of so they're typical cup/cone loose ball hubs. If you've serviced this type of hub in the past, these are no different. As to availability of original or analog replacement parts (except balls) that may or may not be a problem, but you can cross that bridge if and when you come to it.

OTOH if they are sealed bearing hubs, the procedure isn't very unusual. On the bright side, if the bearings are toast, it won't be hard to find a replacement, but you'll need to improvise a bearing puller to remove them from the shells.