Persuader is a great gun for HD. I would recommend taking a tactical shotgun course if you can and spending time at the range target shooting so you can get a feel for the gun. The course will help you to learn proper stance and technique, like the push-pull method of recoil absorption.
Personally I think a stock is better for a shotgun than a pistol grip alone. You could get a tactical pistol grip stock (meaning it has an adjustable stock and a pistol grip) or a traditional stock like those made by Blackhawk, ATI our Hogue. For a 12 gauge I recommend recoil absorbing stocks, like those above, or a Limbsaver pad to make shooting more enjoyable.