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.
---------------------------
On Friday
-------------------------
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.
USCIS inviting visitors to the new Citizenship and Resource Center, a Web portal that has information and resources on U.S. citizenship.