it's really easy... the philips kit has 2 HID bulbs, and 2 HID boxes with an attached wire one each box. You remove the stock bulb and then put the HID bulb in it's place. Then you connect the HID wire on an HID box to the HID bulb. Then you connect the stock wire (that connected to the stock bulb) into the HID box. You'll see...it's very easy.