Landrover freelander engine swop?

does anyone know if it is easy to swap a petrol 1.8 engine to a diesel 2.0 engine in a land rover freelander 2002, would anything else need changing as I have been told the wiring would need doing as well????
Update: thanks to you all for answering my question its really appreciated, think its time to get rid, although a shame cause its in mint condition inside and out, head gasket about to go for the 2nd time so looks like a new car is needed :( x
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