wow, that's a little bold for a guy who just learned how to put a different axle on his truck. you're speaking a bit out of your league. ever tried changing a u-joint in a cv joint? probably not since you're running an np208 t-case, iirc. it's a bit more involved than changing the one on the end of a driveshaft at the pinion. not difficult by any means, but it is different. the contraption is actually a tool designed to remove u-joints. also, if you don't have a vice, it makes the job more difficult, and thus the tool is helpful. so, you can take your newb arrogance elsewhere.
*cough* dipsh*t *cough*