How do you practice "staging" your audition arias?

I have been thinking about a number of points about staging auditions:

• Should I stage it on my own?
• Should I use a personal director?
• Should I use props?
• Should I sit, lie down, or stay standing the whole time?
• Should I stay fairly close to a "concert presentation"?
• Does it really make all that much difference?

I will be addressing each of these points over the next several days, but in the meantime, feel free to weigh in on any or all of the above points.