the whole thing wasnt if it was easy, and yes it has its 'precision' in working on it, but the whole point is your sending it to a shop, 1/2hr for 1 joint alone is a low rate, at what about $30 or more, the thing i suggested, that my shop suggested to me, years ago with those same napa axles, was/is its worth more for that shop, a very good shop it was,, to buy a new axle and install, for 1 outer joint i was paying for 1 whole axle, just for a new boot, and more for a new outer. iirc. same axles i have going not a problem, and as long as the boots are ok the axle should last.
that $30 or more doesnt include parts, which can be like $20 just for a boot,,