the lady who tested me said that about 80% of people come out of the booth and say it was the hardest thing they've ever had to do.
I was really nervous, and agree with Chicken or Fish...sometimes your just not sure if it was a beep or your own heart pumping! I was very nervous about mine since for the last three years, ive been slack about wearing hearing protection on the tarmac and was certain i had hearing loss. But she said i had great hearing.
You'll probably do your test at the same place i did mine. You will be fine. Close your eyes, take deep breaths, and just relax.
Let me know when you book your flights to Perth!!