RE: How many times?
Kevin, Don' t think about the shot ,easier said then done I know. I go through a mental checklist before the shot it really helps.
Something alot of people do at first is lift your head to see where the arrow hit. Usually this results in a missed deer.
If your hunting from a treestand practice from a treestand.
If you can take a couple shots before you go hunting.
In your other thread it seemed like your confidence is lacking right now. That' s a reall bad thing to have happen. Tough thing to get over, but you have to or it will get worse.
Don' t worry about how many missews thge other guy has made. Figure out what went wrong and work on it.