A tart temper never mellows with age, and a sharp tongue is the only edged tool that grows keener with constant use.
People don't want to hear about it if you're frustrated with your big career break.
I tend to get comfortable with the dialogue and find out who the person is in the script and try to hit that. People are sort of independent of their occupations and their pastimes. You don't play a politician or a fireman or a cowboy - you just play a person.