How hard is it to install a TV and DVD player in your car? What does the procedure involve?
Thats kind of a vague question... I mean it deends on the vehicle and the equipment... Some rides are harder to get the dash of then others... I own two 2nd gen S-10s a 96 and a 2000 (slightly different dashes, but) both easy to remove and work with..The door pannels thats another story...
The main question what Gear are you running or wanting to run?
EX. Clarion, Kenwood, Alpine, Panasonics and others make units that have a 6" Screen or bigger and will play CD, CDRW, DVD, MP3 and more...
Then you could have a H.U. Like mine that is a play DVD, but has no Screen, so you have to put them somewhere else...
You could put the LCDs in the Console, glovebox, Fold down Sun visers, Backs of Head Rests, or where ever you want them...
Some places are easier, some are harder..
You could have a headunit that doesn't have a LCD screen or play DVDs, but has an Aux input, so you'd have to find a 12 Volt DVD player and 1 or more LCDs and install them in the above mentioned places...
You could buy one of them all in one bag units from Best Buy that have a DVD player and screen and you just hang it between the seats...
It really depends on your want to do, what gear you want and your ride...
With the info you gave, thats about the best I can give..