I shoot paper quite a bit and it is humbling. It can become tedious however, so I introduced a variant: ' negative paper.' Occasionally I'll just cut a one or two inch hole in the center of the paper plate and hang a can behind it. It's a great focusing drill, and there's a certain entertainment quality to how it changes your perception. Hearing the can ring while the plate remains unscathed is uniquely satisfying. Give it a go if you can...