I don’t think you’ll need to but the liners. I had mine painted and installed myself. The only other thing I did was go to a local bolt and fasteners shot and got black screws that can be see in the wheel wells. Looks a lot better the the silver. They stand out like a sore thumb.
Got my in Friday from Vicrez. Looks great! No damage in shipping. Taking next week to get painted. I may look into that extra splitter from Vicrez. May wait to see after I install bumper.