Not too bad once you have done one but a bit time consuming, yes the whole front of the engine more or less has to come off for just a coolant leak. Ok if its your pride and joy but ours is an old sh*t heap on its last legs although the old donkeys fairly good. Timing gear has to all come off, alternator unbolted and pulled to one side same with power steering pump, water pump off, oil pump off, take the three bolts out of the diesel pump and loosen the two at the back of the pump on the bracket (helps more with getting it on again) only about 6 or so bolts holding the plate on. The oil pump can be a bit tight to pull out.
i went to the local dealers to buy the gasket set as i allowed theres too much stuff to bolt on and gasket sealant might go off before id get everything tightened and it would fry your brain if you had to do that over again. anyways the local dealer was looking £150

for the bottom gasket set but told me he would take £130 still in

F**** ripoff. End up got the gasket set for £40. if you go to your local engine reconditioner he will get you the gaskets for £60 tops. i got mine for 40 as i went to the guy that supplies him stuff you Mr ford
Cost £40 for seal kit which includes sump gasket, gasket for back of alloy plate, oil and water pump gasket, o rings for oil pump, camshaft and crank oil seals. Had leftover o rings fibre washers back engine gaskets rear crank oil seal, sump gasket etc. new timing kit cost £57. So around £100 quid for parts and of course your precious time