We don't need no stinkin' gaskets
That gasket referred to in the planetisuzu post is not a part we have - I think its for the superwinch hubs only.
My neighbor was recently kind enough to lend his garage and a set of helping hands to do this. It took about 3 hours total and was easy as pie. We used about 1/2 of a tube of grease.
thebear54 was right - hand packed is the way to go. Put some grease in your open palm, and hold the bearing ring in your other hand. Push the outer face of the ring into the grease blob in your hand, and repeat until the grease is forced all the way through, coming out the inner face of the ring. Rotate the ring a little in your hand, and repeat, until you have gone all the way around the ring. I then went around again two more times just to be sure.
Good Luck!
Ron