General wiring question

[S13CRAVE]

If you bought a full front clip, shouldn't the wiring be easy because it is all still attached?  Cuz when you take the engine out of the clip, you just unplug a few wires(for electrical part) and take the engine out(not mentioning other things that need to be disconnected).  So wouldn't you basically just drop it into your car, plug into the ECU and go?  Maybe it's just too late and I'm missing something but shouldn't it be simple?  

Thanks!
5:34 am and bored~Ian