It is better to make an appointment. They only allow a certain amount of walk ins based on availability. It's not guaranteed that you will be seen as a walk in
I made an appointment and got in and out in less than 15 minutes at 9:10am, those without an appointment had a long line to wait in, so not mandatory, but worth it
Go on the website and check, you don't need an appointment, but you get in much faster with one
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