To aid the bowler in identifying the correct lane, have the bowler look at the overhead automated scoring display which identifies the bowler to bowl next and identifies the lane to bowl on. If there is no such equipment, you may want to identify the person the bowler is to follow.
Explain to the athlete what could happen if his/her fingers are between the ball when another ball rolls onto the ball return rack. Although it does not enter the rack with much speed, a ball does not stop until it bangs against another ball or against someone's fingers.
Explain to the athlete why the use of two hands is better than one hand when picking up the ball from the return rack. It puts less stress on the fingers and wrist, saves energy needed to bowl for a long time and helps prevent the ball from falling to the floor or, worse yet, on his/her toes.
Do not pick up the ball with the fingers in the holes. Fingers are not inserted until the stance has been taken and the approach is ready to be made. Athlete cradles the ball in one arm and moves to his/her starting position.