H1B Visa Interview Process

[np3358]

Greetings. I filed I-129 Petition for a non-immigrant worker with a Received Date of 20, 2002. Once I get the interview date, I like to know what is involved during the interview. If anybody been through this interview, please let me know how it has been conducted (typ. questions, additional documents, etc....). What are the chances of denying the visa?
I am in Iran now and will be going to Abu Dhabi (UAE), USA Consulate, for interview when the date is granted.
Thanks.
Nader