installin taillights

On a scale of one to ten.. how hard is it to install the altezza tail lights??

All you gotta do is remove the stock tail lights, and unplug the lightbulbs right?? (dont have to take the lightbulb out of the socket do i?) then put it back in. Since the only mod I actually did myself was the reverse gauges. would installin altezza be easier then that or harder??? Does it require for us to splice the wires and stuff?? I hope not.

Btw its not for my car..its for a friend's nissan sentra.