Stress
You'll have the stress of transforming the picture into something wonderful, or getting it wrong, falling flat on your face, and never being hired to score a movie again.
But your main source of stress will be in finding ways to pay your rent when you're starting out. Hopefully you like eating Ramen noodles for every meal. If not, we hear your parents have a great basement, which might come in handy doubling as your bedroom while you're working towards your big break.