I set out to do a cup and cone hub service for the first time. Turned out that the second hand wheel set I picked up recently was shot to h*ll, with the rear dust seals missing. Oof, with no physical point of reference to compare the hub to, it was a bit of a (wasted) struggle. The experience did serve to spur me to buy a Stein Tool hub vise, making the next wheel I did a hub service on--for practice, an ancient 26er--an absolute breeze.
https://steintool.com/portfolio-items/hub-axle-vises/