Everyone was extremely sweet and helpful! One of my documents was "outdated", and they gave me a slip for me to easily go out and print a more recent version of the document. I was easily able to go back in and continue my process. The interviewers all seemed really kind and engaging, and I had a good conversation with my interviewer. They prefer you to speak in English, as far as I've noticed. It seems as of April, at least, they send all "approvable" K-1 visas into Administrive Processing due to checking out social media presences. Overall, it was a very comfortable experience!