figure out yardage on your own to practice for times when you dont have the oppurtunity to use a rangefinder-A couple days before the season i put all my hunting clothes on that i will be wearing on my hunts-including gloves and facemask. This will let you know if anything causes an interference. years ago i missed a buck opening day cuz my bowstring slapped my new coat. since then i always practice at least once with my hunting clothes on!!