You have to find it in the moment, and that's one of the challenges of being an actor - especially a film actor - is that you have to maintain these heightened emotions for long periods of time. There's no trick to it. You just have to do.
One of the things I learned as president is that your life is just not going to unfold the way you want it to. There will be surprises, challenges, and therefore the question is how you deal with the unexpected.
Every day, there's that tension and the pressure. Each scene that you shoot is like getting to that next step, but there's still that mountain to climb. So it's not like one day is harder or one scene is harder. They are all equally challenging.
I always want to set myself a challenge by doing something no-one would expect me to do! But, having said that, I don't feel as a musician you can steer too far away from what you normally do.
I may have absolutely no control over what happens to us, but we can control how we respond. If we choose the right attitude, we can rise above whatever challenges we face.