I have a question for those who have already gone through this process: Once you get your case number from NVC and it is in transit to the foreign embassy, can you start filing your DS-160 and schedule your interview and all that, or do you HAVE to wait for the welcome packet and instructions sent by the embassy once they are ready for you? Ive heard some member say they had their interview scheduled and pretty much ready to go by the time the welcome letter arrived.
If you do have to wait, how long does that usually take after they receive your case?