Yes you do. Just need to go to the government web page and you will be directed to make an appointment and the things needed to bring with you.
Yes you do. There is also a kiosk available if what you need can be done at that.
You do need an appointment.
Depending on what you need to do, it may be best. When I was there, there was a line but I had an appt. Moved very quickly though.
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