On a green run (progress to blue) do regular carved turns. At the end of the turn, hop off of the old edges and switch the edges in the air, landing on the other set of edges.
The hop does not have to be high, in fact the lower the better, but make sure the edges are switched in the air and make sure the skis do not twist while in the air, just cleanly roll the ankles over to the new edges.
Do this for at least 10 turns. The more, the better balance and edge feel you develop.
You can start standing still, then progress to gliding on a green, then a blue.