A very good question. Thanks. I have one handle on the bench, as shown in the photo, and I hold the other handle by hand, usually my right hand. Then gently nudge the wheel with my other hand. Keep in mind, I'm looking for signs of drag. I can feel for no play but cannot feel for no drag.

When i start I likely have the cones set to tight, but no play. I hold the wheel level with one hand then give it a gentle turn, often just enough to get a half rotation, then watch for how smoothly that rotation stops and reverses direction. If it stops abruptly that's drag and I loosen the cones. If it smoothly stops then reverses two or three times then thats good enough for me.

I don't have a truing stand that I can clamp a wheel into with the QR tightened. The Park stands I'm familiar make that difficult due to the shape of the arms at the top of the slot where the axle sits. Besides, I find these handles quicker than getting out a truing stand.

Works for me. YMMV