Pretty darn easy on an 80. Something like, remove old radiator, replace with new one, do up bolts. Fill with coolant, drive.
Honestly, not being an @rse, but it really doesn't get much easier then swapping a rad on an 80. In fact Mr Rubie had one in and out in the field at the Last Lincomb
Shame about not getting the right rad from Autokool. I did post mine on here and it was top notch. Didn't ring anyone, I just ordered it off the web. Came quickly, fitted perfectly, all steel, coated, three core.
What more can I say.
Chris