Actually it makes one heck of a difference. Once you get to thinking like a duck, you'll not only be able to get all the ducks to light on you but will eventually be able to pick the specifics of your shots. I myself like them at 15-20 yards out backpedaling straight on. Take the upper birds first starting from your end of the boat working towards the center. Don't be afraid to move them around while hunting. I do it all the time as conditions change. We do a lot more watching than we do hunting. When you limit out, stay out there a few hours and move your decoys around and watch the reactions of the ducks. You will learn more like that than any textbook answers. There are too many variables to take your strategies out of a book, but they give you a starting point with a lot of basics.