A CD player is quite possibly the easiest install on a 4runner. Im getting ready to do a write up on speaker install and if you want, Ill do a CD player write up too for ya. This isnt something that you can really screw up. Head units are pretty much just plug and play and this will be a good learning experience for you too. Ill try to have it done before the weekend but in the meantime, go to a car audio store (Best Buy, Ultimate Electronics, ect) and get a wiring harness and a single din pocket. Together they'll run ya about $20-$30 but you need them for the install. Seriously though, this is an easy install and you've got me to walk you through it so you've got nothing to worry about, and if you can replace all the interior lights with LEDs, you can do this. This is way easier than replacing instrument lights.