You get to practice and take your time learning all of the lines and blocking. You know what to do and where to go and who to talk to, and then you know what to say and how to say it and when to say it, and then you know what the other people are going to say. It's kind of hard but sometimes real life is harder because you don't know any of that stuff going in.
Like, why do you play Quidditch? It doesn't look easy either.