J.N.
Don't know if this is along the lines you are thinking, but here goes.
The most challenging thing to me, as a mom, is the knowledge that the older my kids get, the more they have to make their own decisions, and the less input I will have. I remember when my brother and I were teenagers, and all the choices he made (started smoking and drinking, skipping class, etc), and all the other things teens do these days, and by then I can't just put my foot down and say no way.
How I deal with it is by building a good relationship with my kids now, and teaching them early what my expectations are. I take as many chances as possible to hug and cuddle with my kids and tell them how much I love them and how proud I am of the things they do. And when they make poor choices, I talk about why it was a bad thing, why it's so important for them to learn to make good choices, and how they can make a better choice next time.
They are 7, 10, and 12, but only time will tell about how will this is working!