just got back from Pittsburgh a few hours ago and I'm a lil disappointed with the car, but maybe thats cuz i was used to my old car

the dude was a dick, the car was dirty as **** and had no gas in it.....
i was wondering how hard it would be to add in all the monsoon sound system **** to my car since it has like no options. these are the things that I eventually wanna add in: Keyless entry (and possibly remote start), Monsoon Head Unit, Monsoon speakers (or atleast the woofers in the back), 6 or 12 disc cd changer, and steering wheel controls (i assume i'd have to get the steering wheel that already has these built in)
i figured all the monsoon stuff shouldmt be that hard cuz id just have to swap out the head unit and add in 2 subs. the guy said he tried to put a keyless entry system and remote start in it but it wouldnt work cuz the resistor chip thats in out keys.
i could prolly get most of this stuff from a junkyard wouldnt u think??