To change a headlight bulb in a 2008 Chevy HHR, first remove the plastic inner fender liner to access the rear of the headlamp assembly. You can also access the headlamp bulbs through the wheel well. The recommended method is to remove the front tire and then the plastic inner fender liner. This way you can access to the rear of the headlamp housing and do the replacing. For a video illustration visit, http://www.youtube.com/watch?v=ldlJdh3M8fs.