I agree. When a wheel is difficult to true it can be because the tension is all over the place (or the rim is bent). Loosen all spokes to a consistent place (like the spoke end flush to the nipple head, or the ends of the threads to the other end of the spoke nipple.). Go around the entire wheel and bring up tension, but not at all tight. Get it loosely trued. Work on getting it round. Then work on getting it true. Dish is easy if you just flip the wheel in the stand without moving the side guides. Dish is just centering the rim between the outside cone surfaces.

BTW, I tend to do my final dish adjustments in the frame its going into, assuming I've already aligned the dropouts.

As you work on the wheel, occasionally squeeze parallel spoke pairs together all around the wheel. Occasionally take the wheel out of the stand, set it upright on the floor and lean all you weight on the rim, rotating over and over all around. Both these actions will help set the spokes and relieve windup. As you get close to perfectly trued and tensioned, the amount you're turning the spoke wrench should be really minute.

Truing a wheel is a slow, methodical process. It should be gentle and uniform throughout, as you bring the wheel up to tension and true. Actually, very Zen like I think.

I have another to build today...