I take it the gasket is leaking?
The sump unbolts, simple as that. There are 2 bolts that hold a transmission plate that need to removed to access the last few bolts, these can be a pain , so make sure you have a long extension bar.
It is only necessary to remove the exhaust front pipe on lower engine models, 1.3 only on a golf mk2, as exhaust is further back on all other models.