Remember that you should always arrive at a Hollywood audition fifteen minutes earlier. Hollywood acting auditions are a hectic process, and things are always changing, so it is always better to be early than late. Do not dress in any costume unless asked to, but dress in attire that best suits the role you are auditioning for. When you first arrive, report directly to the casting assistant. Once you have signed in with the casting assistant, wait patiently for your turn. Be quiet and respectful to the casting assistants; any rudeness will surely be mentioned to the Hollywood casting director. If you have received your "sides" (pages which will be read in audition) rehearse to yourself and wait for your name to be called. Do some exercises that will help you relax, like deep breathing, or closing your eyes and visualizing your scene. The main goal in the waiting area is to stay lose.
When you are called into the Hollywood audition room, enter the room, smile and introduce yourself to the casting director. Hand the assistant your head shot with your resume attached to the back. Announce the audition piece you will be performing and begin when you are ready. Do not wait for the word "action" or any other sign from the casting director. They are most likely tired, bored and irritable. Just be confident and begin your audition after you have introduced yourself and you know your audience is ready. Thank the casting director when you have finished and leave immediately.
Once you have finished your acting audition in Hollywood, wait another two minutes incase that the casting director wants to bring you back in to read again. After two minutes, sign out with the casting assistant and leave quietly.