GRAS uses the ACP observatory control software. It has been a while since I used them but pretty much you enter your target and the number and length you want to take with each filter plus the binning. If want to use one of the OSC cameras it is even easier. You should select to focus at the start of your run. If you would like to practice maybe register for the demo that DC-3 Dreams has online. You can register
here.
A couple of things to watch out for is that the sky is clear and that a flip will not be required during the run. The scopes will take an image even if the roof is closed. A pier flip during the run will cost you points.