At the interview, stay confident, calm, answer any questions, behave naturally, and remember that on the other side of the window sits a man, not a robot, no lie detectors and other heresies, which they write on the forums. "Consul" absolutely not interested in your personal life, especially because all of his questions, the answers he already knows of the DS-160. The consular officer, according to American law, to make sure that your intentions are pure, you do not have immigration intentions, and you will return home at the end of the trip. The main factor for obtaining a visa to tour the US presence will travel abroad, and the more trips (Priority visit Schengen countries), respectively better. For example, you have been in England, resting in the Czech Republic, Germany, and Spain and safely returned home without thought to remain in these countries, which shows your travel intentions. And it is quite logical, arriving as a tourist in the United States, after a rest, you'll also return to his homeland, where he continued to work or study. But this does not mean that if you do not travel abroad, you will get 100% visa denial US must consider your visa situation as a whole and to prepare for the interview. Most importantly - do not show that much torn in America, that without this trip will come to you "doomsday", less words "want-not”. It's almost a sure failure! US consular officers are very professional psychologists.
If you really sincere intentions, and you do not intend to immigrate with the help of a tourist visa - a chance to refusal of a visa is very limited. But your excitement, stiffness, confusion, and other signs of visa officers cannot understand correctly and to refuse a visa. Therefore, if you are going to visit the United States for the first time, we recommend you ask for help in getting a tourist visa to the United States to the professionals. We also provide services for the preparation of the interview: analyze your story, make a plan a trip according to your data and to prepare for all kinds of issues the visa officer with alternatives (I mean, if something goes wrong during the interview plan, you'll be ready for it).