Usually it's best to do your turn in the middle of the wall where you would do it in a race. As you are coming into the wall move over slightly so you can hit the turn in the middle. Sometimes on longer sets people may rest at the wall. If they do that they usually rest on one far side or the other, thus if you turn in the middle, you don't disturb anyone.
As you complete the turn, you push off on a slight angle so that you are on the other side of the lane keeping the center clear. Pushing off on an angle allows the next person coming in room to complete their turn.