Set up your camera as close to final position as possible. Then, use the pan and tilt to get the verticals correct. It doesn't matter if your tripod is level as long as you don't change anything after locking down the tripod head once you have the verticals correct. Then use rear swing to fine-tune the horizontals.
The problem with using pan to get the horizontals correct is that if the tripod is just a tiny bit out of level, panning will skew the verticals that you just worked so carefully on, so you have to go back and re-do them, then you have to check the horizontals again... Using swing at this stage is faster by far. It should be a real time saver with a ball head too. Yes, if you swing the back, you'll have to swing the lens stage too to get focus, but you should be checking that anyway.
Just ask a cinematographer how carefully they have to level their tripods and heads in order to do a decent pan shot. Tripods for still photography are not nearly as sophisticated as good cine tripods/heads either.
With my method, you don't even have to worry about setting the tripod up level (another time saver and a blessing on uneven terrain). Eyeballing is just fine.
Best,
Doremus
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