How to Relax and Work Like a Pro

When I was in high school I took a photography class and one of the first things they teach you in photography is how the light meter works on the camera so that you can take pictures properly exposed. One guy in the class continually comes in and he has not finished his role of film and it's like weeks and weeks and weeks  and he can't finish the role of film. He finally finishes the role, develops all the pictures and everybody's like what took you so long? And he says "it took me forever to take all these pictures" It turns out that he just never understood that you could change the shutter speed or the f-stop or anything he was just going around