New Stereo/GPS and DVD player/s for the back seat?

Has anyone replaced the stereo on a 2013 or similar model double cab tacoma? The factory is fine, it's not the sound I'd like as much as a gps built-in.

Then I'm looking into options for dvd player or players for the back seat for my kids. 1 is likely fine, but I did see at a Toyota Dealer that someone put players in the headrests, but I bet that's expensive. I'm not looking to spend a fortune and I don't have a preference if it's controlled only by them in the back or if it's done in the front with a feed to the back, but I don't want to tackle wiring it from the front to the back if that involves taking the whole dash apart and carpet up, etc?

Is replacing the stereo fairly easy or is that pulling the dash as well? I'm not looking to spend a fortune either, but it's nicer than using your phone all the time.

 

You could probably do the install in about 2-3 hours (assuming that you've never done it). You don't have to pull the dash, just the ac controls panel, and the stereo itself.

This is a link to a sticky from the A/V section. It's a stereo install walkthrough:

https://www.tacomaworld.com/threads/stereo-upgrade-basic-how-to-2nd-gen.571/