Do I need an appointment?

Yes

So, I've walked in a dozen times or more these past years and while you do not always need an appointment, it is advisable to just call, get your name on their book that you are coming. They'll tell you how things are working there that day, and get you a time. And you'd better show up on time, and call them if you cannot make it! It's the proper thing to do, and you wouldn't want to he treated like that, now would you?

No but sometimes they r busy . If u just call they can normally get u n quick