Depending on the model year and body type of the attachment points are slightly different.
To remove the front bumper need to Unscrew the two screws (spun down) under the headlights that hold the bumper reinforcement to the body. Remove the screws in the wheel arches and remove the fasteners in the wings. Then the assistant pulls the bumper forward (look for wires). Releasable connectors of wiring and hoses to the headlight washers (if any).
From the trunk, Unscrew the four nuts that secure the amplifier bumper to the body. Unscrew the screws in the wheel arches and removed the clips in the wings. Pulls the bumper back and release the connectors of the wiring harness (if any).