the speakers just make sure to get the right sizes, then it's a simple unscrew, unconnect, connect, screw in process.

for the head unit you gotta get a harness that brings all the loose wires into a nifty pastic plug and solder that to the back of ther head unit, make sure to use heat shrink or electric tape to cover all exposed metal, and then plug in and screw in,

usually places like best buy do a free install on the expensive units they sell so it might be worthwhile to just go that route,