It's not a hard job at all. I just did mine with the kit from quad4x4.com, and it only took a couple of hours. Most of that time was spent banging out the bearing races. The quad4x4 kit came with all the needed tools (big freakin' socket, seal and bearing installers). I also upgraded to the reuseable axle nut kit so I can pull the hubs at any time if needed without having to replace the factory nylon locknut and plastic locking wedge.
Count on the pb shoes to be shot from the lube, so I'd replace them. Another pleasant surprise was my disk brake pads falling apart when I took the caliper off, so I'd get a set of those, too.