I'm a pretty firm believer in the good 'ol up and over drill-
Traverse across the hill on the pinky toe edge of your uphill ski, with the tip of your downhill ski lightly touching the snow. Now complete a turn, balancing on the old inside ski as it rolls from pinky toe edge to big toe edge and becomes the new downhill ski. Throughout the turn, make sure the tip of the ski you are not balancing on stays lightly touching the snow- don't let it come off or be forced to place the rest of the ski back down. If the tip of the ski picks up, its likely you let yourself get in the back seat (probably at the top of the turn). If you have to put the ski down flat on the snow, you are no longer balancing on your outside ski (probably at the end of the turn).
Do this slowly on easy terrain at first. Make sure you do not rush the top of your turn- embrace the part that feels like shit and live there until it no longer feels like shit. A nice progressive motion from beginning to end is what you are looking for- no forced or awkward motions.