I don't have much advice to offer that hasn't already been said multiple times. Two things that I would emphasize would be accompanying your spouse to the interview and bringing your W-2s. I sent them to the NVC but I was still asked for them at the window. Luckily, I did have my 1040 and she made me fill out another affidavit of support. The whole process including waiting in line was less than an hour. A couple interesting observations from the interview:
a) She allowed my wife to interview in Spanish.
b) We studied over 40 possible questions in English, but all in all my wife was only asked about 4 or 5 and they were very easy questions. No tricks.
Consulate / USCIS Member Review #13659
Review on January 19, 2014:
