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.
I'm wearing three hats; I'm acting, producing, and directing. I was very involved in developing the script, too. But to me, that is very liberating. To me, the lower the budget, the more I want to be involved. I want to be more in control of my own destiny when there isn't much money involved, because you don't have the experts who can control your destiny.