To change the headlight bulb on the Toyota Avalon, start by opening the hood in order to access the headlight. Remove the bolts that hold the headlights using a ratchet. Use moderate force to detach the headlight bulb wiring. Set the new headlight in place and attach the wiring connections. Tighten the bolts that hold the headlight in place. You can find more help by watching the video on the following link http://www.carcarekiosk.com/video/2008_Toyota_Avalon_Limited_3.5L_V6/lights/headlight.