Well, I have never shown dogs (yet!) but I have shown horses both under saddle and in breeding (conformation) classes for many years. I still get nervous. My advice however is to channel that nervousness from "OMG, OMG" in a bad way to hyped, focused feeling. Kind of a everyone is watching me, my dog rocks, we can totally win. I guess I mean learn to enjoy the nervousness, almost think of it as excitement instead like a kid at Christmas. It sounds impossible probably but you can do it if you set your mind to it. I don't think I am explaining this well but you can ask me questions if you want to clarify my rant.
Mom to: Abby & Haley