I've trued a ton of rims. In my early 20's all my roommates rode bikes. I'd true their rims for dinner and beers. I'd just flip the bike over and do it right on the bike. I'd hold my circular spoke wrench against the fork or seat stay and edge it close to the rim. Turn the tire slowly and make note of where it rubs. Adjust from there. It's pretty easy when you understand how to losen and tighten so you don't develop an egg.
I've never developed the interest (patience) for truing wheels, but have done some over the years in a pinch. Zip ties on the fork or frame always worked just fine. As such, I never invested in a truing stand.
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