Anyone who watches football can see a big difference between high school players and pro players. For example, it's second nature for a pro quarterback to have his feet correctly positioned to make a throw, but even a good high school quarterback doesn't have the repetitions and the muscle memory to do it correctly every time. Rookies make mistakes.
Beginning deer hunters also make mistakes. Certain things — even the food we choose to eat in the deer woods — can reduce our chances of of bringing home the bacon, er, the venison.