PFLs - if your instructor is any good he will have generally pulled engine failures over small fields. In your test your examiner will probably do so over a stonking great one.
The main thing is to enjoy it. The examiner isn't trying to catch you out, just to make sure you're safe. I had a great time on my GFT, it was probably the most enjoyable flight I've ever done. I made sure I got to know my examiner before the test and it really made a difference. He kept asking me questions and, about 1 hour into the test, said "You keep looking at me suspisciously." I said "Yup, I'm wondering whether you're trying to catch me out." "No, I didn't know the answer and wondered if you did!" he replied....
Do watch out for nasty tricks. If he points to some interesting ground feature and shortly after your engine starts running rough... make sure he's not turned the fuel pump off! I won't disclose any more secrets.
