I have never seen a TRS guide. I just made sure the one leg went behind the trigger and pushed straight down with my needle nose pliers. I was just able to get one coil on my allen wrench (used it instead of a punch, could not find a 1/16 punch anywhere), so I then pushed the rest down with a screwdriver and slid the allen wrench the rest of the way over. Then pushed out the allen wrench from the other side with the trigger pin.
I would say about 60 seconds is all it took once I got the right pliers.