Ok, it is not complicate, but takes time. I just reserved an appointment for visa application for my mom-in-law yesterday, the first available date is Jan. 4, 2005. So you won't get visa before that.
To apply the visa, first of all, make an appointment either via phone or the web page which you can find out from American Embassay website. Then you just need go on time for the interview. You can get the visa on the same day of interview if they give you.