Just chill out. It's fatigue! The most important shot you take when you go out to practice is the first shot. Always take that shot from no longer than 25 yards and judge yourself by that. That is truly the max range that you will need to be deadly on shooting your bow.
Your stand should be set at that distance maximum and most usually are. By the time the leaves fall off completely and you may have to take a longer shot than 25 yards, you will have practiced much more than you have today so stop trippin. You'll be fine opening day. It's your nerves and confidence that you need to worry about and not your pins for opening day.