Dryfire trigger presses on targets of varying difficulty is a drill I do regularly. I'm paying attention to the wobble of the sights before the press, and to any disturbance of the sights during the press.
But, @feudist let's back up and hear what your motivation is for working on your trigger press. Do you have a specific problem? Or just want to improve this part of your shooting?
In many cases, "misses" are not caused by a "bad" trigger press, but a lot people think they are.