There's really nothing special about it, just make sure that none of the needle-rollers get crosswise in there.
When you press them in, going a little too far will cause them to bind, so just a rap with a hammer in the opposite direction will loosen them back up again (but put the circlips back in first.
There's also some thought going into which way to orient the grease fitting__if present__or it can get knocked off right at the threads.
Probably a thousand You Tube videos on the subject; if you've seen one, you've seen them all kind of thing.