This is nt hard to do, you need to take off the bumper to have access in removing the headlights. Our OEM Mitsubishi Ballast are located below the headlight assembly. What is wrong with your HID? Did the ballast go out? Or the bulb went out? You need to find out which one went out and buy the parts at the retrofit source , they have great D2S bulbs, you can go aftermarket or OEM Osram if you'd like. As for the Ballast, the Morimoto should work great. Our OEM ballast are a bit expensive.