On the 90th day, I make an appointment. The earliest day on infopass is 5 days later on Friday, so I make that appointment, and print out the sheet confirmation with the barcode.
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On Friday
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I went to the line at 10:00am for my 10:30 appointment. The guy at the door says you can't come in yet, come back 15 minutes later. That means even if you come really early before your appointment it is pointless. It is best to come 15 min before.
I had my interview in downtown L.A and my experience was extremely pleasant. There was a parking structure right in front of the federal building that charged 13.20 for all day parking. My interview was on November 17th, 2008 at 2:15 pm and I left 2 hours earlier than usual. Good thing because there was a very long line into the federal building itself .It took me 30 minutes before I got to security point. So it was until 2:00 pm when I was able to get into the building.