Keeping it real is a very important part of being a good teacher, especially when working with teenagers. Put your money where your mouth is and do everything you ask your students to do. Let them see your process, let them see your failures, let them savour the joy of eventual success with you. Transition from theory to action. Not only do you deepen your understanding of what you need to teach, you gain the respect of your students. After all, if you can't do it- why should you expect your students to?