Download/find the workshop manual for the Z and study it, then have a look round your car, take off bits and replace them(just remember to buy new gaskets!etc) this is the best was to get your confidence and see how the car works, twin turbo is a bit too complex but I will try fitting a supercharger one day
If you can do a service on the Z you have some skills lol not the easyest engine to work on.