I keep mementos from everything I've done. I've got my cab driver's license from 'Happiness.' I've got a pair of glasses and a belt buckle from playing John Lennon. I've got a pair of sunglasses from playing Andy Warhol... It's all in a box in the garage.
You have to feel confident. If you don't, then you're going to be hesitant and defensive, and there'll be a lot of things working against you.
If the work is going well and it's something that has value with some meaning to it, it gives back a lot.