A shop regular in Denver taught me to flip my wheel before truing it and my back stopped hurting
I was truing a rear wheel in the stand at my bench in Denver, leaning over it for 20 minutes, and an old mechanic walked by and said just flip the wheel around so the wobble faces you. Felt dumb, tried it, and cut my time down to 8 minutes with way less crouching. Anyone else got a small trick like that they wish they'd learned sooner?
Flipping the wheel is smart for the same reason you want the two sides matched at the end, not just one side true. If you only eyeball it from one side, you can get a lateral wobble that reads fine one way and ugly the other. Same logic works for dish: flip it in the stand and check both sides before you call it done. If the gap between the rim and each arm isn't the same when you turn it around, the dish is off even if it looks straight.