After passing sales qualifications you take a test called the GRILL. Its grueling and lasts 8 hours. It was an experience of a life time and it breaks the weak. I can not give an answer just make sure to start asking co-workers advise the day you start.
The business must always outwardly present the impression of the customer always being right (the answer is yes to any reasonable request kind of deal), but in reality customers can make unreasonable demands.