It was a pain in the as*. You replace them as follows: disconnect the neg. terminal at the battery... under the hood, behind the headlights are two rubber caps that just slide right off. Then the connectors supposedly pop right off. Mine took a good deal of persuasion to be removed. There did not appear to be any special way to remove them. I used my index finger and manipulated them until the were free. The side with the overflow tank was the hardest, because I was unable to remove the tank. So it was a bit more difficult. Once the connector is removed, there is a clamp holding the light in place, you push it in, and move it to on side to unclasp it. Then the bulb can be removed. Note the position of the bulb. As you will install the new bulb in the exact same orientation. I still have to adjust my bulbs a bit still, as this morning I noticed that one bulb was higher on the garage wall than the others. I have not noticed a huge difference. I'm not convinced that it was worth all the effort yet.