City turbo swap is quite straight forward mechanically, engine drops straight in on your factory mounts/mounting points, gearbox bolts up nicely and manual eb civic gear linkages work. Only hard part is wiring. Also helps to run new fuel lines with an external pump.
Lower is hard, need shortened shock for any kind of decent drop. Also the 4x100 swap is easy, but finding the wagon hubs you need is hard, theres only a few sets in NZ afaik.