you mean the bulbs or the whole headlamp assembly?

Changing the bulbs is pretty much easy, just pop the hood, and you'll see the 2 adaptors behind each headlamp, the inner one(near the grill and radiator) is the Highbeam which you don't really need to replace and the outer one (near the corner lamp and fender) is the lowbeam which is what you'd want to change.

Highbeam bulbs are 9005
Lowbeam Bulbs are 9006

Taking off the bumper is another story, if you WISH to take it off, just ask and i'll post instruction on how to.