When I arrived, I was very nervous, and the Japanese worker who took my paperwork scared me a bit. Not the friendliest. However, the actual interview itself was nothing to worry about, it took less than 5 minutes, the American worker was very friendly and empathetic. He didn't take the majority of the huge paper stack that I assembled, but ah well.
They said the visa will take maybe 5 days to get here.
All in all, a pleasant experience.