Follow through in everything you do. As challenging as it may be, you need to be disciplined enough to be where you need to be, when you need to be there, whether you want to or not. By being strong in your resolve and resisting temptation to give up, you are setting an example for others to live up to.
Choose your emotional response to a situation carefully. Sometimes you'll need to practice the art of silencing your inner thoughts when they're not appropriate in order to set a positive example.