The best advice about the CFO that Jaycel said she got. from here on VJ by the way (thank you VJ Family!), was to bring all of the evidence of your relationship that you sent to USCIS and brought to the embassy and be very familiar with it because they will go through it all and ask you questions about it. Be honest with the counselor and pay attention to the seminar part because they will ask you questions to see if you were paying attention. Most important, be polite but FIRM with the counselor that you are 100% confident in your fiancé, that you know him and love him and that you are ready to begin your life with him in the US. Be confident in your relationship because it will show the counselor that they can issue the certificate without worry.