They sell a package that has everything you need. Whether you buy from them or not its always a good reference of what you need. I bought anything that was new from Coz, then the transmission and drive shaft i got locally.
As for time, Me and a local member did it in just a few weekends. It is said to be a big weekend project but as things usually go with the Z we ran into some set backs along the way. If you can find a knowledgeable member here or in a local club to help you that would be useful.