It's not that hard to throw a good tea party! ^o^ I've done that countless times. For starters, it would help the atmosphere if you turned off the TV, and maybe put on some nice classic music (or no music at all, if you prefer). It's also nice if the house is clean and neat, and maybe even the furniture would be Victorian-inspired? A dream tea party. Behaving and being polite is a main part as well! Remember to dress in your finest clothes, and have proper table manners. There's not really much to it, just use common sense and you should be alright.
By the way, I personally love tea parties where you're allowed to bring your own porcelain dolls for tea as well... =D