if you're doing a double din you can use the base factory trim...
no need for the metra kit.
you're going to need a T20 torx screw driver.
also probably recommend you get some EZ felt from some artsy
store just in case you got a gap between your factory stereo facia
and the factory trim.
i also solder all my connections so you'll need a soldering gun,
solder, and some e-tape.
if you want to make a video bypass switch, you'll need to get a
normally closed momentary push-switch. you'll also want to
have a drill/drill bit to install your push switch.