My wife was very nervous but she said it was not as bad as she expected. The people were nice to her and it went well. They didn't ask for a lot of documents just her DS-230 and passport pictures and her P4 letter for the interview. She went in at 6:30 am and was out by 10:30. She recommends to be prepared with your paperwork as she saw a lot of people getting a green document with missing documents required. She had a nice vice consul and he just asked a few questions and wanted to see the wedding pictures. He told her she was approved on the spot and told her have a safe trip to the States.