Calm your nerves.
Control your breathing.
Feel your heartbeat.
Focus on a target 800 yards away.
Slowly squeeze the trigger.
BOOM.
The world explodes. The rifle punches you in the shoulder. Your concentration vanishes in a cloud of muzzle blast and burnt powder.
Then you settle back in, find your breathing, find your heartbeat, find the target…
…and do it four more times.