When you are anxious, you tend to take shorter breaths. Remind yourself to breathe full, long breaths.
By pretending or seeing yourself calm, you can trick your body into relaxing.
Music is calming on your mind and body. Don't listen to music that is too hype, so your body does not tense.
The change of scenery can distract you from your nerves and calm you down.
When focusing on dropping your shoulders, you will be able to relax more.
Relax, lay down, close your eyes - do whatever if it helps you relax.