A monitoring visit run the way a real one runs: the water column instruments in, the station reference re-established, two photo points chosen and documented, and three frames captured at each.
Choosing photo points is where most people go wrong, and the error is always the same. You will want the most interesting piece of reef — a photogenic colony, a dramatic overhang. You want the most workable one: flat enough for four charts to lie near one plane, with bare substrate beside it to set them on, identified by a feature likely to still be there in ten years.
Capture is the heavy part. Four charts to place is four chances to touch something you should not, and a diver concentrating on chart geometry stops watching their fins. Lay the frame with its long side along the bearing, A far-left, square check, three frames, re-seat between, count the charts back in.
If there is gas and time, this is where your CoralWatch survey at the station happens.
Afterwards — in the surface interval — you write the documentation, do the frame check, and score. Write down what you nearly forgot: the detail you had to stop and think about is the detail a stranger will not have. Your instructor reads the documentation before Dive 3 and will tell you where it is ambiguous, but will not fix it. That is deliberate.