The process of filing a visa application can be a complicated one, as there are a lot of details and constituencies involved in the legal process. This goes for any legal process in all honesty. However, it doesn't need to be as nerve wracking as it might be made out to be. If you research beforehand what to expect, prepare all of the needed proofs beforehand, and maybe even hire a professional to help you fill it out. There are some basic things to keep in mind when preparing to fill out and file a visa application.
Be sure to have all needed proofs before filing. Research this, know what you need to prove who you are and make sure to copy all material and keep record of it in case anything happens to the ones filed. Proofs for visa applications differ depending on what visa you are applying for.
However, there are some basic ones that are needed for all visas. Pretty much you are proving your identity, so a copy of your birth certificate, proof of legal residence in the country you are applying from, and driver's license will be mandatory. Depending on which visa you are applying for, proof of assets, employment, education, and a medical history might also be required. Simply know what you need before even beginning the application process and you should have no problems after filing.
To make the process as quick as possible be sure to keep all employments. An in person interview is usually required and a representative or official may need to contact you frequently. Showing up to all scheduled interviews and answering your calls, letters, and email in a timely manner will prevent any delays from occurring.
Another way to keep the process going smoothly is to hire a professional legal representative at the beginning of the process. They will help you in filling out the application, gathering all required proofs and can act as a go between with the officials and yourself. Don't be afraid to ask for help. While most of the process is simple and can be done by the individual it is just easier if you have someone who knows what they are doing to back you up.
A visa application can take up to a year to be approved barring any unforeseen circumstances. So, after you've completed the initial filing be prepared to wait. But don't let yourself get anxious over it. There is no need for a visa application to be that stressful for you. In fact the United States has one of the highest immigration acceptance rates in the world. So as long as you do what is needed, provide what is required, dot your I's and cross your t's, the entire thing should be close to a cinch. Ask your legal representative or immigration official any questions that may arise. Don't be afraid if you have questions. The more you know the easier it will be for you to wait.