Just make sure it is laid out efficiently. You don't want people reaching over one thing to get another. Also, make sure you have the right serving utensil - little tongs for cheese, for instance. They are also making squirt bottle sour cream now - that might help some.
I did one for DD's graduation a few years ago. What worked for us was lots of different stations. I used crock-pots for the hot items and double bowls with ice in the bottom. I had different types of shells at one table, meat and beans at another and toppings on the third one. We had a separate one for her cupcakes. I had plates and silverware and napkins at each table. It worked out well.
Lettuce was the last thing on the toppings line. The one thing I find interesting is that a lot of men like to put their cheese on first so it can melt; wrong, wrong, wrong!
I'm sorry that you don't know how to properly enjoy a taco. HAHAHACheese goes on directly after the meat so it can melt (heat rises). Lettuce should be last because that's the topping you don't mind as much falling off when you are eating the taco.
Like the sour cream in squirt bottle idea. It goes on in huge clumps with a spoon, so people have a tendency to then smooth it out over the taco. That leaves shredded cheese, lettuce, salsa, etc. on the spoon when it's returned to the bowl of sour cream.
I'm sorry that you don't know how to properly enjoy a taco. HAHAHA
Yes.
Put fish on it.