Quite a simple job really, it all depends on what you have on there in the first place as the zetec s has the exhaust coming out the rear of the engine where as the endura exhaust is at the front, they all have the O/S engine mount issue which is easily overcome, shafts are pretty generic on most of the FWD fords so depending on the box you use that's pretty straight forward too, the hardest part in the loom but if you've done a bit of wiring or have loom diagram of both fiesta and 2.0 zetec its a price of piss,
Just remember if you decide to change the flywheel make sure you get a cps to suit as the air gap is critical