In the dark there is nothing to identify the different donkey throttles, you go from memory.
The twisting motion as has been said on here is a bit different too, especially as it only winds off to idle unless you press the other button on the collective which isn't as easy as one might think having practiced it.
Apart from #1 being at the top half of the collective with long grooves and #2 being the rear half of the collective with nobbly bits. But I only know that, just like a lot of other things, from memory.
The pressing of the twist grip buttons to shut off the engines isn't too difficult in normal circumstances, which would be to shut down the engine(s) after landing having had a fadec failure. The process of shutting down the engines by using the twist grips is not done in flight, and would only be difficult if you were also trying to fly the ac during an emergency where you have decided, for whatever reason, you need to do it.