Before leaving home for the consulate, review the checklist of documents you received and make sure you have everything required, making special note where originals are required and where copies are sufficient. Then make an extra copy of everything to bring with you as well. You should also speak with your attorney to make sure you have no grounds of inadmissibility that would arise at the interview, such as fraud, alien smuggling, or certain repeat immigration violations just to mention a few examples. This is especially important if you are coming from the United States since the waiver of unlawful presence you may have just been granted will not help you if other unanticipated problems arise at the consulate. You do not want to get stuck outside the U.S. and find there is no return possible. So have a full conversation with your attorney prior to departure.
The day prior to your interview, there will be a medical examination. This examination requires disrobing, and physicians will be noting, among other things, the presence of tattoos. Some tattoos can lead to a suspicion of gang membership and a denial on that ground. No appointment is necessary, but you must show your interview appointment letter and bring your passport. The exam includes an x-ray (applicants age 14 and under take a tuberculosis skin test instead and will have to return days later for a reading) and a physical examination. Screening by blood test for certain diseases may occur. You may have to receive vaccinations if you cannot produce records showing that you do not need them. Physicians will seek to discover, among other things, if you have a problem with drug or alcohol abuse or addiction and will refer you to a psychologist or require a urinalysis if they deem it necessary. A finding of inadmissibility for reasons of abuse/addiction will require a showing of one year of remission.
Biometrics will be taken in a center near the consulate and are required of all applicants age seven or above. Appointments for this can be made online before or after the medical exam, but it is best not to leave it for the day of the consular interview since that may not give the consular officer sufficient time to review the results. You will need to bring your passport, DS-260 confirmation page, visa appointment letter, and ASC appointment notice.
The interview itself is often quite brief. Applicants are issued a ticket and sit in a waiting area to be called to a numbered window where they meet with an officer.
At the end of the process you will designate the DHL location where you want the visa package delivered, and this can take a number of days.
An important reminder: the plaza outside the consulate and clinic is full of fraudsters and con artists pretending to work for either agency. They aggressively approach applicants, sometimes wearing counterfeit badges, and try to sell services or "arrange" people's papers for them for expedited processing. Avoid these people at all costs since they could damage your case or at least steal your money. No actual employee of the consulate or the medical clinic will ever operate in the outdoors. Please do not fall victim to these scams. Equally important, seek a legitimate hotel in the vicinity of the consulate since there are also reports of scams associated with questionable accommodations.