Don't be immature and stay strong. Act like the age you are. Have maturity. When you speak, speak proud, strong, and loud so everyone can here you. Stand up straight, and don't be a dead giveaway. Don't act scared and fearful, but act like the one to be feared. Don't act like a God because you can change laws and stuff, because at anytime, you can be impeached. Lastly, make sure to not look like you just came from a rib eye steak house, but look professional!