Its pretty simple to do yourself, but if you want to get it done I'm sure any local shop would probably do it. The main problem is legality. You can quite easily hook up a ballast and an HID bulb into your existing headlamp, but it won't be legal. Your car headlamp (reflector/lens) is designed for a specific halogen bulb, and while an HID bulb would work fine in its place, it won't be legal. If you're worried about legality, you need a new reflector/lens setup. This is going to be a decent amount of cash. If you could care less, then all you need is a pair of ballasts, and a pair of bulbs. D2S bulbs are for projector lamps (lens + smooth reflector) and D2R bulbs are for reflector lamps (no lens + contoured reflector). Don't go for high colour-temp. lamps (bluish) -- as cool as you may think these look, they are actually less efficient. Hunt around on the web if you want to find the lowest prices. A kit is going to be $200+, but don't just buy the cheapest one; quality is important.