Remember a few things and you'll be fine:
1. Drink good German Bier
2. Dont eat (besides the pretzels)
3. Whatever you do, go when its dark so you cant see the filth
4. Drink good German Bier
5. Polka
6. Boots (although I am disappointed they went to plastic)
7. Drink good German Bier
Lets all be honest, the place is gross. But their beer is fantastic and the German kitsch grows on you after a boot or two.