Before attempting this move, you will need to be happy with:

Travelling backwards & sliding. 180 Slides

Apart from the obvious, there is very little difference in the technique between 180 and 360 rotations. A little more momentum will help you achieve the extra ½ turn.

If you have trouble getting all the way round, spot a landmark on the horizon before you start the move. In the rotation turn your head until you are facing the landmark again. You should find your lower body and the buggy follow your head movement and make the rotation smoother. All rotations benefit from this technique.