Correct preparation is the key
Well beforehand research the audition location on a map! Plan the route and take parking, traffic and travel time into consideration. The last thing an actor needs is more stress. Be wise and leave plenty of time to get to the audition.
Start with the audition material, or sides. Often, that's all the actor will get. If possible, read the entire script. If it's an audition for any TV show already on the air, watch the show. Who's the audience? A show created for Disney Channel is usually much different than one meant for the Showtime.
Next, work on the sides. Actors have different methods for doing this, but generally, it's best to get as off-book, or as memorized as possible. You have to feel like you are living the scene and having to rely heavily on the paper in hand can get in the way of being in the moment. You still must always brings the sides but use them as a safety net, do not rely on them. They are looking for strong, creative choices that are interesting to the audience
Overcoming the fear factor
There are so many factors beyond the actor's control on whom and why someone gets the role. An actor is often one of hundreds being seen for a single role. Do not show or feel desperation. It's the last thing an actor wants to carry into an audition room. With the right preparation, knowing how to respond, and being present in the room, any actor can learn the confidence needed to have a great audition.
At the Audition
Be early for your audition.
Be respectful of other waiting actors. Don't use the waiting room as a warm-up space, find a separate area, or better yet, do it in the car, if possible. Also, be aware of the surroundings. Often, a casting office shares a building with other businesses, so be sensitive to the fact that they may not appreciate actors being loud in the hallway or lobby.
Come prepared with a headshot and resume already stapled together back to back. Asking them for a stapler will just make them irritated.
Casting directors don't enjoy searching for the next in line actor. Pay attention to the sign-in sheet order and be available and ready to go when you are up next.
Once you go in for the audition
If an actor goes in to an audition room carrying fear, desperation, frustration etc. it will show up. This is when preparation can really help with stress. Go in with confidence, with an open mind, with positive energy. Casting directors want actors to succeed. Make their job that much easier by giving a great audition.
Don't assume the casting director or assistant wants to shake hands or hug. During the winter, shaking hundreds of hands a day might not be the healthiest choice for a casting director.
Once in audition room, take a quick moment to look around. This is your audition so be comfortable. If there's a chair in the room it doesn't mean you have to sit in it while auditioning. If the audition is on camera, the casting director may want the actor to not move much, but it never hurts to ask about the allowed range of movement and how tight the shot is.
Ask only those questions that legitimately need answers. These would be questions that will help clarify the scene or understand a word, term or reference. Don't ask how to play it the scene or ask them what they are looking for; those decisions are yours as the professional actor.
Do not fall into the trap of feeling rushed. Own the room and the space. Show confidence but not arrogance. If it's the beginning of the audition and there's a mistake, don't hesitate to ask to start over. If the sides are mostly done you should not start over. Make that first impression very memorable for all the right reasons.
After the audition
After you have finished auditioning quickly thank them and leave the room. Do not beat yourself up after the audition second guessing your audition. If you prepared diligently before hand and gave your best effort just let the chips falls as they may. You never know exactly why they choose or don’t choose you for the part. Dom keep your sides you may need them for a callback. Move on to the next audition and continue to practice and learn from every audition. Always keep a positive attitude and enjoy the journey.