PEWGF in itself isnt hard, whats hard is that you have to start PEWGF justframe on top of it being a justframes. Just doing a i13 ewgf with kazuya or i14 ewgf with mishimas in neutral isn't hard, nor is it very useful.

The more you can focus on your opponent the better, your peripheral vision will still perceive the distance so its best to focus on your opponent, but it takes time.