Actually idea is pritty simple. You got your ground kit bumper, for example Blackwidow, you place it against your existing bumper, and mark the places where you´ll need to make a holes in your esisting bumper so mold slides on. DO NOT mode ground kit bumper. Only thing you have to mode/cut drill...etc is your existing stock bumper. I said before it´s better to screwup bumper that you can get gor $100 on junk yard then screwup ground kit bumper that is 400$.. So after you´re able to fit mold over your stock bumper. You´ll need some artistic talent to find bugs and missmatches. Is those mathces are progressive -you will need dremmel. Otherwize you´ll need to fill it with fiberglass fill. again DO NOT MOD your ground kit bumper.!!! Only if there small things that needs to be grinded or cut off!!. After you are all done and everything looks great. You use the best double side tape you can find. I recomend 3M. Clean with acetone. Use a heat gun to warm tape and stick your bumper on. Be sure it´s holding good. Then after about a day. You can paint it.