What about the I-134? I have already gathered W2's, bank documents (signed by a bank officer) and a letter of proof of employment from my employer. Are there any other financial documents that I will need. I have a 401k, would proof of that be needed? As for the DS-160, I think fiancée once tried to fill one out for a tourist visa, but it would never let her finish the process. It apparently has a time limit and will kick you out and make you start over if you don't finish it in time, but their site would load so slowly she could never finish it.