When I read a script and have my first interaction with this character, do I feel like there's something I'm gonna' learn here? If I feel like it's something I've done before, then what's the incentive for me to do it?

When I read a script and have my first interaction with this character, do I feel like there's something I'm gonna' learn here? If I feel like it's something I've done before, then what's the incentive for me to do it?