What Danni said, don't over stretch them. Set them up like a rectangle. Front feet square under their shoulder blades and back hocks should be just slightly past the goats tail head. Feet should be set up a hands width apart between the front legs as well as the back. Set the feet closest to the judge up first. If you put your hand on your goats hip and slide it down to its lower leg then move it, your goat will not be as jumpy. Also walk calm and smooth. Always keep the goat between you and the judge. Never go behind your goat. And always keep your eye on the judge and be aware of your surroundings, don't over crowd the goat next to you. The more you practice with your goat the more you and your goat will become comfortable with each other.
Good luck!