They are very easy. First pull it apart and make sure its clean inside. You may just need to grease it. Just pull the 10mm bolts out and then slide the hub off. Be careful about turning the hub while its out, hold on to both side of it when you do it. It's a very simple design.
When you put it back togeather be careful not to over tighten the bolts, they're only 10's and they are going into aluminum.
Oh ya, they are aisin hubs right, not warn (i hope).