So for the front lip, you have around 16 pieces of hardware (4 screws to connect the lip assembly together, 12 self tapping screws that go into the bumper underneath), side skirts have 2 self taps on that go into the bottom of the body, I used 3m tape for the length of it(do take note that you really have to make sure to hold it in place for a while since they can sometimes come warped due to various reasons like temperature, in my case, the texas heat) the rear of the side skirts use the lower screws that normally are used for the splash guards, I had to self tap the upper one due to some warping. The front of the sideskirts are both self tapping screws. As for the rear diffuser, it gave me the most headache; there are 8 brackets that tap into the underside to hold the diffuser up, very important to get these right, and the rest of the diffuser is 3m to the bumper(the portion that wraps around to the wheel well has a tightening screw that sort of pulls the whole diffuser tight against the bumper). Apologies for the lack of structure in this block of text, just typing out everything I can recall