Bumpers gotta come off bro. you at least have to undo the right side, you might be able to squeeze the old light out by just undoing the right side and doing a little bit of tugging. It's a tight fit.

The nuts holding the right side of the bumper in are underneath the headlamp, you have to remove the battery and the plastic casing the battery sits on and perhaps the radiator fluid reservoir to get to it.

It's a bitch to replace those headlights. Enjoy.