For the actor…
Yes, you know how the story ends.
But we in the audience don’t. It’s our very first time.
Therefore, play each moment, each beat, each scene, as if you’re in the audience. Expect your actions and tactics to work. Fight for what you want right up until the very last line.
And who knows? Maybe this night will be different. Maybe this night you’ll break through to the other person. Maybe this night you’ll achieve your objective. It should feel like it, anyway.
P.S. – Speaking of concealing your intentions, this Seth Godin post.