A lot of my best parts I've been the second choice for, so you never get too egotistical about anything.
No matter what the character is, I just say to myself 'If I, Melissa George, was in that situation, how would I react?' and once you do that you can just go for it, and hopefully the performance comes through.
At the end of the day, they're happy if you do the obvious songs towards the end of the set and you've got to try and make yourself happy by doing certain songs at the front end of the set.