You dont have to unplug the battery... you can so it will soft reset the ECU as mentioned, but you can also reset the ECU with the car in accessory mode (it think?) and pushing the gas pedal in a certain pattern. I forget the process but you can youtube a video of what to do, I did it the peddle way after I installed my exhaust and HFC.
But literally you can go in your drive way, jack up the car, unbolt the old exhaust and bolt up the new exhaust and that is it. Extremely simple, you might be thinking this through a little too much. Any exhaust shop, or any shop at all, can install the exhaust for you very easily and everything should be aligned fine as long as they arent lazy or rushing.... or just suck at what theyre doing.
have fun!
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