One of the biggest worries in the process is the "fiance visa interview".  Many people think that  "fiance visa interview" will be the most difficult part of the process.  The goal of the "fiance visa interview" is to verify that you have a real relationshp with your fiance and to verify the informaiton in the petition.  Many of the fears and feelings of trickery stem from cultural and language disparaties.  However, there are always many cases of people being grilled at their interviews.  That is why careful preparation is essential.  For people who are very nervous, it is always helpful to have your petition prepared by an immigration attorney.  Qualified immigration attorneys can help your fiance prepare for the interview.
 
Don't memorize, but do prepare.  Preparation includes giving your fiance a complete copy of the petition to review, dressing correctly (this is a government office not a night club) and going over the answers the questions. Most interviews are short, ranging from 5-15 minutes. 
 
The following is a list of sample questions that some fiances are asked at the "fiance visa interview":
 
Where does your fiance live?
 
Where was your fiance born?
 
What is your fiance's birthday?
 
How old is your fiance?  If there is a large age difference, how will you deal with that?  Can you really love someone 20 years older than you? 
 
What are your fiance's parents' names?  Brothers and sisters?
 
Where do they live?
 
Has your fiance been married before?
 
When did your fiance divorce?
 
Why did your fiance get a divorce?  How will this marriage be different from the last marriage?
 
Does your fiance have kids?  What are their names?  What are their birthdays?  How old are they?  Where do they live?
 
Would you take care of your fiance's children if they came to live with you?  Will your fiance take care of your children if they go with you to the US?
 
Where does your fiance work?  What does your fiance do?  What is your fiance's job title?
 
Have you ever been married?  When did you get divorced?  Why?  Do you have kids?  Brothers/sisters?
 
What does your family think about your fiance/engagement?  Have they met your fiance?  When?  How did that go?
 
How did you meet your fiance?
 
When did you first meet in person?
 
How long have you known each other?  How long have you been dating?  How much time have you spent together?
 
When did your fiance propose and where?
 
When was the last time you saw your fiance in person and where?
 
Have you ever been to the U.S.?  When?  Where?  What type of visa?  How long did you stay?  When did you come back?
 
When do you plan to go to the U.S. to be with your fiance? 
 
Where will you live when you enter the US?
 
When will you have your wedding? Where?  What kind of wedding will you have?
 
Did you have an engagement party/bridal shower?  When and  where? 
 
When did you tell your family and friends about your engagement?
 
How does your families feel about the marriage?  Have you each others families? 
 
What are your fiance's hobbies/interests?  Do you share those interests? 
 
What do you like to do together?
 
What is your birthday? 
 
Where do you work? 
 
Will you and your fiance have children? 
 
What are your plans for the future?
 
Do you feel that your religious/cultural differences will affect your marriage?
 
If you don't share a common language, how do you communicate with your fiance?
 
Why do you want to come to the U.S?  What would you like to do here? (.i.e. get married)
 
Why do you want to marry your fiance? 
 
What do you like about your fiance? 
 
Why do you love your fiance? 
 
Make sure that your mutual love and respect shines through.  p.s. never answer why are you applying for a K-1 visa with "to go to the us".  You are applying to be with your fiance.