I never spend any time waiting in a tire store. I always drop off loose wheel/tire assemblies, and pick them up when ready. Of course, you need a second vehicle, but aren't we all car collectors?

For me, the easiest way of re-installing a wheel on lug studs is to sit with the wheel between my legs so I can directly see the studs through the wheel. I know the tire shop guys don't do that, but I've never figured out a better way.