The one that bolts onto the from slam panel snap then yes is a drill and tap job, don't usually causes any problem, is the two hidden under the aches ... they are usually shagged. If they snap you are lucky, if the square plate bolt spins in the bumpe, then is a right pain to remove.
long extension bar and plus gas and they usually come out easy without taking arch out.. just undo the front of it and pull back a little. I never snapped one yet *touch wood
I plan on replacing the bumper with a new one, so the bolts underneath arent a problem if they snap etc, but of the square things spin I will probably just yank the bumper away from them