It's easy to lean back on the leading ski but you can't really lean back on the trailing ski. You can make sure you aren't pressing it's tip down though. Be conservative and stop to think or rest before you fall. It's tiring to crank a stop but more tiring to face plant. Get lower by bending your knees so that leg can flex with the turn too.
Beginners often mistake bending at the knees with bending at the waist.
This teases and taunts the Gods to rub your face in it bad. Of course, reading this article alone won't stop you from carving corn furrows with your nose. We all have to learn not to do by doing. And such is life.