First open your trunk lid to expose the entire bumper cover.
Note when you open the trunk you will expose 2 round panels that will pop out on either side near the bottom of the taillamps. Use a small screwdriver to pop these off to expose the bolt that is behind either cover. Remove these 10mm bolts from the area, you should place all hardware and covers in the truck or somewhere you will not loose them.
Now kneel down and look at the underside of the car from the rear, follow the bumper cover down and you will see where a couple clips hold the lower bumper cover to the undercarriage of the body, use a small screwdriver or pry tool to pull the round inner portion of these clips upward to seperate the clps and then slide the clips out of the body and set aside.
The last 2 pieces of hardware are in the fender area.
If you kneel down next to the rear tire on each side look at where the bumper cover and the fender meet....inside the fender liner area there is a small oval opening where the bumper meets, stick your finger straight up in this hols and you will feel the 10mm bolt sticking straight down, remove this bolt from each side of the bumper (driver and passenger side) and this is it for wardware.
Now grab the bumper cover at the front near the fender.wheel area dn pull it outward away from the vehicle, once you disengage the bumper from each side it will simply slide back to fall off the car.
I recommend having an assistant to help line the new one back up and be careful to not damage the paint.