You can remove the front valence, but you'll need to remove the headlights to unplug the parking light wiring and then feed it down through the grommet hole. You'd also have to remove front bumper guards.
Personally, I think removing the valence is unnecessary work to remove/install a bumper, but I've done a ton of them, so it's no big deal. I would use a couple layers of cloth tape to protect the valence where the bumper bolts are.