Basic mechanics: how do you actually manipulate upper control arm alignment cams?

Gentlemen, good day.

Before start with messing with my caster/camber alignment at home, I was hoping someone could clarify exactly how one manipulates the alignment cams on the upper control arms (1969 Dart). I understand the theory as what they are supposed to work, but there is no explanation in the factory manual as to how one makes it happen. I have toe plates available and the Deco/Longacre bubble gauge.

• Does one remove the wheels to access the bolts that lock down the cams? Seem like not, as the wheels are on at the alignment shop; plus the toe plates. But:
  • there's hardly any room to get up in there with wheels on (225 60 R 15s in front...)
  • isn't there some kind of load/force/friction on the cams, just from the weight of the car?
  • does one cut the wheel all the way to one lock to get access to one nut, then all the way to the other to access the other nut?
  • or do you try to reach them from underneath?
• How does one physically spin/manipulate the cams? I didn't see any way to readily get a grip on them or pry them one way or another....
• When going from one side to another (passenger/driver) , do you torque the nuts all the way down to lock the cams before switching sides, or can you leave loose?

I have looked but not found any posts on FABO or youtube showing how one actually does this.....

Thanks in advance for your help.

Chris