I installed them the same day I installed the fenders on my truck. Installation time fender liner was about 30 minutes and I'm in no hurry! I didn't have to remove the wheels and just had to drill 2 holes in the frame on each side. One tip; If you get these AND rear fenders, install the interior panels FIRST! This saves you having to remove the mudguards immediately after putting them on! Don't ask me how I know that!