This is what has been taught by Doug Koening and where I picked it about 10years ago.
Stand square to the target, toes pointing toward target and feet about 2-3 feet apart depending on your size. Extend arms out with a slight bent at the elbow, I find it helps with recoil better. Gun comes up to your eye. Also remember that when gripping the gun with two hands you want the pressure to be 30% with your shooting hand and 70% with your support hand. At no time do your hands tighten on the gun while squeezing or pulling the trigger. Your hands are just a platform from which you hold the gun. Your trigger finger is the only thing that moves when you are firing a shot.