I started with pawn shops and apartments - neither shop was great for a do-over.
In retrospect, I would prefer to start with a type of shop I had done many times sans video first - just so that I was comfortable with the assignment itself and could focus on the video being the only "new" thing. I would then practice the various positions in which you will need to stand/sit in order to keep the target in the frame as much as possible. For an apartment, for instance, you will likely spend time sitting across a desk from a leasing agent. Will your camera get that shot? At the same time, you will spend time walking with the person. Is the camera going to be angled such that you get the person's head and not the ceiling or his/her shoes? Etc. Find a way to quickly test your camera angle before you are in view of the leasing agent. Make sure you know how to quickly adjust your camera angle if you test it and it is bad. Be comfortable with concealing your camera when you are ready to go - without risking unplugging it (that one cost me $60)....
Practice, practice, practice. ....
Hard work builds character and homework is good for your soul.