At the South Side pavilion entrance, they will ask to see your DS-160 and passport.
Next the the security check...after that you walk up to the main building, and go to the receptionist who will ask to see your DS-160. From there you take the lift to level 1. From there you wait for your number to show up on the screens above the interviewing booths stated on stickers which will placed on your DS-160 by the receptionist...once your number pops up they will ask you to see your documentation, they will ask for the documents a bit at a time, while asking some questions.after that you will be asked to take a seat till your number is called up again...when it is that is when the interview itself takes place.