if you can't even do it on the range, how can you expect to do it under stress, hmm? 2 x, it was while on night guard dog duty in the army, openly worn, non-issue rig, overseas. thumbsnap bianchi, as a matter of fact. We werent supposed to even have a mag in the pistol, but i did anyway, and carried chamber empty, but cocked and locked, so that I could practice my draw and dryfire. You apparently dont have a clue as to what great things humans can train themselves to achieve, with audiences watching, even. here is starter info for you. follow the other links and be amazed.
Remember that just because YOU can't do something, does not mean that others can do it, quite handily. You probably can't play concert level piano, for instance.