You can't show up on set and expect it all to come together. You have to have a plan, much like how the director can't just show up and go, well, where should I put the camera? That is gonna determine how it is lit, you should have already been in the room looking at it earlier, pre-lit the room, you know there is a lot of prep that goes into it, so it is the same thing with acting. You can't just show up.