This is about what I used to do a lot. It does work great. But I would add one thing. Notice where the infer red light is in relation the the shotgun's light, that's the bird. If you stop the barrel in the corner, you are going to shoot behind the bird. The problem is stopping the swing in the corner. Don't stop. Finish the swing through and as you meet the corner, dry fire and keep swinging. But this using the light is a great idea. I've always assumed I bad the barrel.s along the edge of the ceiling and the wall, using the light you know your in the right spot. The guy that taught me that, back in the late 60"s told me to use the ceiling and wall joint to resemble the flight of the bird.