We had our interview on February 9. We started lining up as early as 5:30 AM. We finally got inside the embassy premises a little past 7 AM.
There were basically 5 main steps to complete the interview for the day: Prescreening, biometrics, oath taking, interview, release/receiving. While there were so many people, I thought it was organized in general. There was confusion at first but as long as you read the signs and follow the ushers' directions you'll be ok.
Just a tip though: You will wait a long while for oath taking and especially for the interview. My fiancé and I were so hungry at this point lol.
I think it was almost 11 AM when we were interviewed by a CO. The CO one assigned to us was friendly. He asked both my fiancé and I questions. I was so happy when he said 'I see no problems here' and then confirmed we have been approved