Just did this as well on my front Dana 44. It's a very easy job, just invest in a breaker bar.
I did have a bitch of a time getting the steering knuckles off due to crud (oil,dirt,etc) crammed into the ball joints. mikemounlio is right, you need to beat on those.
The ball joint tool you rent at AutoZone (or any other store) will work, you don't have to have the special adapters, but it helps.
Here's two writeups from Stu's site that helped me:
Unit Bearing - 1
D30 Ball Joint Replacement - 1