Hang a 5 lb weight on the end of a 12" wrench...done:lol:
Seriously, if you cant estimate 5 ft lbs working a wrench with your hand perhaps you shouldnt have it in your hand in the first place. Not like its super critical and you have to be within an inch/lb, your going to back it off anyways so its horseshoes and handgrenades....close is good enough.
The key is to be spinning the hub in the forward direction of travel WHILE tightening it to seat the bearings. Backing it off 1 flat then tightening finger tight sets it to allow some heat expansion without loading the bearings. Been doing it this way for well over 40 years and never had a bearing failure.
Dont get lost in the minutiae, it'll ruin your day :poke: