"Teach a man to shoot a shotgun and he will trim  your trees forever", said nobody ever. Well maybe there is a somebody who would say such a thing. This gentleman has a shotgun. He also has a tree that needs trimming.

There are many reasons to trim  your trees in springtime. There are many methods of trimming trees. None of the methods mention using a shotgun, that doesn't stop this guy from cutting back the deadwood and letting the sun shine in.