I suppose you could meditate or do yoga, but I’ve found regular rounds of clays to be the fix. Muscles have memory, so when birds take flight your body does what you trained it to do. Focusing on the target is also an easy way to calm frazzled nerves. So you just missed, so what? You’ll get the next one, just take a deep breath, focus on the target, and kill it. And it’s always easier said than done.