V6 driver's side is manageable but time consuming. I changed mine a little while back, it was just the gasket, allow most of a day.
The hardest part I found was removing the coolant pipe that runs to the rear of the block. Even with the scuttle removed it is very hard to see and feel the mounting screws behind the engine.
It was necessary to remove or reposition the heat shield over the steering box to increase clearance for some purpose I can't quite remember.
I was lucky and all the manifold nuts either came the studs, or the studs themselves came out. It's probably best to fit all new nuts, they are brass and intentionally distorted to lock.
You will need at least; manifold nuts, M6 from memory. Downpipe nuts, M8.
Manifold gasket, should be later metal type. Downpipe joint gasket. O ring for coolant pipe at back of block.
Soak every nut with proper penetrating oil, plus gas or similar and expect to separate cat to silencer joint. I found angle grinder and then drill/retap threads in cat the easiest way. M8 studding and nuts for reassembly.
At least it's not the passenger side.