as said, remove the bolts from the brackets bolted to the front rails after unplugging the park lights, then remove the whole assembly. it is good you have an assistant. they can help prevent any scratches or dings in the removal/installation process as well as being a second set of eyes when setting the new bumper to proper clearance and leveling from side to side. another thing to consider. don't "crank up" the bumper bolts too tight, as i have seen this cause depressions to appear around the bolts, as well as sometimes this causing the chrome to crack there as well.