Yes they open at 8am and yes you should make an appt months in advance. If you dont (like me) you will get there at 7:30 and wait an hour minimum. They let you in a few people at at time, make sure you have your old license with you if you are going for a renewal (it is $32 bucks).
If you are going for registration only then go to the door on the left as you are looking at the building - you will have no waiting.
The drivers license renewal test is easy just reading the signs. Have fun and enjoy the people watching!