where i live, a bipod really wouldn't work well. too many hills, eneven surfaces, trees, tall grass, or brush, etc.
if possible, i'd rest the gun on a nearby object, such as a tree, tree limb, rock, or anything available.
while in the woods deer hunting, sometimes there is not enough time, or a opportunity for a rest. i use a nylon sling attached at the grip and forearm for packing the 14" gun, and use it as a shooting aid for offhand shots.
i place my left hand on the forearm, and right hand on the grip. the sling is adjusted short to wrap under my left elbow. applying outward pressure with my left arm tightens the sling and provides a fairly steady offhand hold for me.
if sitting on the ground, you may rest your elbow on your knee. practicing all positions will help.
using these methods, i'm convinced i can shoot nearly as well as i could with a offhand rifle shot. confidence in yourself is a big plus, IMO. lot's of practice will help your ability, and confidence.