As Mike said, at low speed (forward or back) use engine throttles, not wheel, to drive boat. An exercise I always did with willing crew was - in a mooring field I would instruct them to (using only throttles) back the boat away from mooring, turn right angle and go to downwind of another mooring, another right angle turn to face next mooring, go straight to that mooring. Typical reaction first time was to spin in circle, turn much to far, not understand what downwind means, etc. However, one 20-something took the helm the first time and executed everything perfectly. When I congratulated him and asked him how he did it he said, "simple, it is just like a video game!"