In the 747 There is one tiller per side for steering. Maximum deflection of the nose wheel is 70° either side of straight ahead. When 20° is reached, body gear steering is automatically engaged. With the rudder pedals, a maximum of 7° deflection can be reached.
It is a very strange feeling when looking out of the cockpit doing a tight turn, almost as though the aircraft is reversing or sliding sideways. (if that makes sense)