To replace the headlight assembly you will need to take off the front bumper. To replace bulbs, you do not need to remove bumper. Get a manual, it shows the location of all the retaining screws. Once the bumber is removed, the headlights are held in by two 10mm screws I think. Something like that. You may need a rachet driver with an extension to reach one of them from memory, but you should be able to work it out once you pull the bumper off.