Saw a kid hunting once and he asked me what the secret was. For this kid it was take one bullet. He was always shooting during the evening. He denied shooting, but all in the area knew he was.
Deer see movement very well. Deer hear very well. Deer smell very well. If you don't let them see, smell, or hear you and you are where they want to be it will happen.
Here in Upper Michigan everything breaks loose opening morning. All the preseason scouting and baiting in the world goes right out the window as the war starts. You need to figure out where deer go when the action starts and bush whack them on the way. I suspect most northern states with a short season are the same. I know eastern PA and northern WI are.
Use enough gun.