And, you will probably have to experience it a couple of times to believe it, but, he WILL see you and most likely run if you move your gun very much. Once he is committed and coming, get your gun up and braced on your knee. Make sure he is totally behind a tree before you move it very much once he is within about 70 yds.
When he is close to being in range, use your thumb and forefinger to quietly take off the safety. And then, keep your booger picker outside of the trigger guard until you are ready to shoot him.
Again, once he is close, you will not have the ability to take your gun out of your lap to get on him (unless you are in a blind, and maybe not even then) unless he goes totally behind a tree without him spooking.