The government is quite picky and insists on forms being filled out completely and correctly. If a field requires an answer, do not leave it blank. Instead, type ‘none’ or ‘n/a’. This shows that you did not omit answering the question. Your form should be free of any typographical errors before submitting them.
Your application needs a lot of supporting documentation. This documentation should accompany your application, and accompany your fiance to the interview. The best defense is a good offense…and in the case of immigration law, more documentation is always better than less.
Immigration law can be complex. It is easy to make a mistake on the process. If you submit the wrong thing at the wrong time, your application will likely be kicked back to you. Be sure to follow the full process.
The way you need to view the entire Fiance visa process is that you at all times have the burden of proof to show that your relationship is legitimate, you intend to get married, you are not engaging in marriage fraud and so forth. It is NOT the governments responsibility to prove guilt. It is your responsibility to prove innocence. Many K-1 denials take place because of insufficient proof on behalf of the applicant(s) of their true intent.