I would say just be aware that there will be loads of bits and bobs to price up so maybe as a rough guide double the cost of the engine to get it installed depending on what is coming out, I think it ended up costing me about 800 to get a tdi into my seires but i got loads of spares i have to sell on so think it will end bup about 600 ish.
But you will need obviously oil filters and a clutch which is the best part of 100 quid, best to do the rear crank main wiht an oem seal there about 10 quid, fule filter, youll need to fit an intercooler pipe kits are about 60 quid but there easy enough to fabricate, a down pipe is about 100 quid. if you need an oil coller i got mine for about 30 quid. but obviously there are always little bits if your going from a 2.5 td or something it s not too bad as your oil cooler lines will fit but i think you will need to get some new power steeting lines made up.
You could probably do it cheaper than i did but its best to do it properly.