Question about makeup counters

... can I just go to a counter at the mall and say to someone, 'Show me what you'd do to my face if it were my wedding day?' And if I like it, I just ask them to do my wedding?

I don't understand how this process works, but I've seen a few other girls around here who've done this and I am curious. To be honest, I am not willing to spend boatloads of money on numerous trials with numerous people, nor do I feel like shlepping my butt all over the island.

Anyone have any experience in this?