Start with tracer turns. Choose one foot. Ski with that ski on the ground but as little pressure on it as possable. Turn left and right. After some practice switch feet so the other ski has virtually no pressure on it. Doing this gives you a less athletic, less demanding intro to turning both directions on one foot.
Once you can turn both directions doing tracer turns, step it up a notch by skiing with one ski completely off the ground.
Option #2 practice Royal Christies. Turn right on the right ski with the left ski lifted as high as you feel comfortable and reverse for right turns.
If you are ready to really commit and have confidence in your balance skills, go for it. Remove one ski and ski.