When I bought my first double trigger gun, I spent time learning to select the desired trigger and after a while trigger selection was imbedded in my sub conscience.
After using the front trigger and rear trigger for a few shots, I set up two traps. One was close and the other further away. With help from my wife and a friend, clays were launched randomly and I attempted to make the correct trigger selection. It didn't take me very long to get it right.
A few weeks before the bird season, I repeat the trigger selection drill and even though using the rear trigger first (Mod barrel) happens no more than 5 or 6 times a season, I'm pleased to have acquired the skill.