You need to "pick up the single action revolver" which to me was tricky as a single and a double look very similar. The trick I used was trigger position. On a single action revolver the trigger is further back (rearward) in the trigger guard (hammer down position), only when the hammer is cocked does it move foreward. With a double the trigger is almost centered in the trigger guard (hammer down position).
Also, when ACTS PROVE'ing a single action revolver where the chamber does not swing out/ action does not break (and you are forced to load each chamber individually through a loading door) you need to use a cleaning rod to assure that the revolver is not loaded. You cannot view this from any position on the revolver, and contrary to the typical ACTS PROVE you do NOT look down the barrel (because, for testing purposes you are unsure that its loaded). Just poke a rod down the barrel, the trainer should have one on the desk infront of you.
Another tip I can give, do not set the firearm down unless you absolutely must, because every time it leaves your control you must re-ACTs PROVE it. And when unloading the revolvers simply let the shells drop onto the table an leave them there, don't worry about collecting them into a pile or putting them into a box.