Gentleman at the desk friendly and helpful, didn't ask why I was there early. Just gave me a form to fill in, looked at the appointment letter, circled the original appointment date, checked my passport (ID) and told me to take a seat in the area where the prints were to be taken and I'd be called.
The person doing it asked if I was going to be out of town, I said no, we don't have a car and I had borrowed one to do some other errands and thought I'd kill two birds with one stone. He went ahead and took the prints and picture.
I was in and out in about 25mins as there were two people ahead of me.