Answer: Practice gun safety
Step-by-step explanation:
For one thing, this is the one thing all people have/need to learn when using a firearm in places such as a gun range. The person(s) who handles the firearm must be licensed to carry one too.
Make sure the owner tells you if there is or isn't a safety switch. In most cases, this function prevents the trigger from moving back completely to fire a shot. If it doesn't have one, YOU MUST keep your index finger off of the trigger, and off to the side. This will prevent you from shooting yourself on accident, or someone.