You don't need no stinkin hunting license to shoot something there's not a bag limit on. You also don't need no training either- just keep the business end of the gun away from your face.
Eye protection is a good idea in case the gophers start throwing rocks back at you, but hearing protection isn't necessary, especially if you have a wife at home who's going to nag you about wasting an afternoon shooting varmits. Who needs to hear that. right?
Ask him how many beers he's bringing; if it's less than a six pack you might want to bring your own, and maybe a pint of Crown Royal to calm your nerves and steady your aim.
Now go have fun, pilgrim, and shoot them gophers. Do it for the Vegans and the cows.