I'm sure it's been asked 1000 times and 1000 times over, but I'm unable to find a post useful enough.
I own a 1.25 Fiesta, and I've been told by some that a Puma engine is a pretty much nut and bolt job, is it as simple as they make out? Just a matter of slinging my old engine and wacking the Puma in? Or are there other things needed from Puma? Loom etc etc?

Ben.