Thanks for the comments, and to respond to some:
I was able to take the nuts off by hand, without the use of a tool.
As noted in my initial post, I know some (if not a lot) people tighten the castle nut without a torque wrench, however, the owners manual and the literature from the axle manufacturer (Lippert, if I recall) state to torque the castle nut to 50 ft lbs, to seat the bearings, then back off the nut, then finger tighten for the last step before securing the nut.
As this is the first time trying this operation, I figured I would follow the manufacturer's recommendations, at least until I had done this a couple times and was a bit more comfortable doing it "by eye".
If for no other reason, at least I can argue that I followed the manual to a tee, when I am passed by the wheel and hub as I am going down the highway at 60mph.:D
Marv