By no means a complicated conversion as its the same car bar the arse end of it.

As Jesse said depends what management you want to run, there are many different options, but the engine and running gear will all drop straight in. A full Series 2 loom will take a couple of hours to fit to the car as one option.

The gearbox doesn't need changing, you can run the standard box if you so wish but i would strongly recommend fitting a proper turbo box so you benefit from the LSD.