Just mount the scope. make sure the gun cant move. Look down the barrel then look then the scope to make sure they are aiming at the same spot. I put a cardboard box at 100 yards and tape a piece of whot paper on it. When I look threw the barrel and see the paper then I do the same for the scope and you should be within a foot. within 2 or 3 shots you should be zeroed. Saves money in the long run JMO