"Easy" for some is mega hard for others, ...but sure you can take it all off and return to standard easily enough.
The only thing is it will need remapping to suit the charger so it will need remapping again to return it to standard should you wish to sell it but still not hard.
Not sure on the full spec of the 370z Nismo though as I'm rocking around in an older 350Z but you will have to do some supporting mods for the charger. E:g for my car I'd need better fuel injectors, higher flow fuel pump etc so you may need similar for yours depending on what it's got as standard.