The First Assistant Director is in charge of stressing. Seriously, that's the job of the 1st AD: Stress out. The 1st AD is responsible to make certain the film is on schedule. That means constantly prodding lazy people to get moving, and suggesting that the director just get the shot, even if it's not perfect. Remember, a shot is a shot. A shot without time to shoot it, is not. The 1st AD is the only other person who can yell "Cut". The 1st AD also yells, "Quite on the set!" The 1st AD's line is: "Time is money." And in your case, as I once said, "Money is time. We have neither, so let's make a movie."