Imagine you are about to go in the room for the biggest call back of your career and the best acting coach / teacher / mentor you have ever worked with looks at you and tells you the two things you need to focus on. What would they say? Make an effort to keep this answer in the affirmative.
Your own best advice
Imagine you are about to go in the room for the biggest call back of your career and this time you're the both the expert coach and the actor, what would you tell yourself are the one or two things you need to focus on? This may or may not be the same answer as above. Trust yourself - remember you are the expert now. Make an effort to keep this answer in the affirmative.
When and where was your best call back ever?
Remember the best call back you ever had where you ended up booking a great job or getting a wonderful role. If you haven't booked yet, just one where you felt you could have, but it's better for a part that you actually got. You should remember it as a very positive experience where you felt good before, during and after. You walked away satisfied, still wanting the job, but whether you got it or not wouldn't change how you felt about the experience. Now describe when and where you were. Be specific. How old were you? What city? Which casting office? which room?
What did you do to prepare?
What exactly did you do the day before to prepare? What were you doing in the lobby / waiting area before you went in?
Describe how you felt as you walked in the room
Be descriptive as possible. You can describe it emotionally, physically and mentally.
Describe what happened in the room that made it such a good experience.
Who did you talk to, what did they say, what did you do?
State the singe greatest moment of that callback?
The one moment from that call back that sticks out above all the rest that makes it such a positive and memorable experience.
State the single most important thing you did that helped you book the job.
Can either be in preparation or in the room or possibly both.