Depending where you are from, you might not even have an interview. In my case, I went to the Consulate, handed my paper and they asked me to sit. Few minutes (well hours...) later, they called me, asked me to swear everything was true, requested my fingerprint and asked me to sit again for few minutes (well hours again...). Then, a guy showed up with my passport and the visa. That was it.
If you can prove that you can support yourself in some way (listed on the documents), then you are fine.