It matters not how long you prepare or what skill level you obtain. What's important, is that you stay within your limitations when hunting. If you can only accurately shoot out to 15 yards, then don't take 20 yard shots. Since you're new, pass up a shot that you're unsure of even it the animal is real close. Hitting a shoulder or other major bone is not going to work in most instances. Wait for the shot you know you can make.