Actually, it's difficult to say what aiming method I'm using myself. I'm sure it's instinctive with a little bit of gap thrown in there. But it's nothing I think about. So, it's quite possible that when you're starting out it's something you may need to be more aware of. When you get used to a certain gap at a certain distance, it'll be second nature, ingrained in your mind, and essentially instinctive. But like Don said, don't worry about how you do it...as long as it gets done. Also, good questions by Charles.