Well, I think on second units it's all about execution. Because you come in there, you don't have to worry so much about the studio and all the other actors and all that.
Opportunities are usually disguised as hard work, so most people don't recognize them.
Never angrily rant into your web cam. While smashing a keyboard in half over a game of 'World of Warcraft' may seem totally justified in your head, to the rest of the known universe you look like a raging psychopath.