Hi
Just did it this morning, very easy. Look for the thick red cable that's clamped along the front of the engine block.
You need to make sure you have the right set of box spanners before you start but the only thing I had to remove was the air pipe to the middle of the engine block to get to the glow plug on the right hand side.
The nuts connecting the wire to the glow plugs weren't ferrous so I had to be careful not to drop them or lose the in the engine. A few spare nuts wouldn't be a bad idea.
Cheers
Gerrard