Go to a parking lot or a flat grassy area and practice. First practice coming to a stop without clipping in at all. Learn to come to a stop with only one foot down. Then practice it clipped in. I know there are different attitudes about this, but I think it's better to stop by unclipping just one foot. It's faster in emergency situations and makes getting started again from a stop easier. Better to learn that from the beginning though IMO than to unlearn a different habit.