Thanks for your quick responses.
@Claes Conversely I use the tripod 0.1% of the time. The main problem is that I lack practice. Post-correction does weird things to people’s geometry.
@paperdigits I definitely have a problem with 1. The camera is as close to the wall as possible at the other end of the room due to the crop factor (1.6) and lens (50mm) combination. Unfortunately, that is the only gear I own. Perhaps 2 would help add distance. 6: Not if some of the youths decide to cover, cross or roll back their eyes every single time.
1. One thing I have noticed about the camera is that the focal plane mark is behind the tripod socket. Would that affect the alignment? Should I use a piece of hardware to slide the camera forward a bit?
2. If everything is level, I think the only problem that I am facing is centring and horizontally shifting the frame properly. I guess my problem is that it is more awkward to adjust the tripod than it is to move my arms and feet. Any tips on how to do this effectively and efficiently?