Start off at 10 yds , then 15, then 20, to build confidence. A lot of people only shoot during hunting season, or are a new shooter. Then pull their bows out and start at 20 yds. (Because everybody else is shooting there.) Well, if you're rusty then your accuracy is going to be off. If you are a new shooter there are things you need to work on well ahead of hitting center at 20 yds. By starting closer you build confidence and therefore stop self doubt.