Make sure you are well prepared. Know your role, your text and the tone of voice.
Customize your appearance on the role, including clothing and makeup (but keep it low key). Let your hair hang loose.
Walk confidently into space, because from that moment your casting has started.
Introduce yourself. Don't rush through your text and/or spelling.
Keep your facial expressions calm. Use your eyes, body language, timing, and your voice unless instructed otherwise. Give variety. Play towards the camera.
Keep empathizing with the scene. ‘Acting is pretending while pretending you are not pretending.’
Listen carefully to directions. Never stop of your own accord.