You do not need an appointment but the are always busy I would recommend one. Unless you are very patient and have the day wait. My husband drops the car off waits a while the walks across the street to eat. He's never in a hurry when he goes.
no but it's always good to.Call see how busy they are. and get an estimate of when they might get to you. normally if it's a quicker to fix issue they will make the time to check it out and fix it. within first couple hours of you waiting there if it's something your not sure on they'll normally get it in for a quick look over and let you know what's wrong and give you a time frame of when they will get to it and how long and much it will take to fix
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