Well four hours later and many colourful words sprayed about it's done. Glad I won't have to do that again.
For anyone thinking of doing it i'll leave a quick low down on the procedure...
- undo and remove the two lower nuts 14mm and one top nut 17mm on the mount to be changed
- undo and remove just the top nut 17mm on the other engine mount
- undo and remove the lower nuts 14mm on the transmission mounts
- (this alows for the trans and engine to be lifted up together without any stress on the mounts by stretching them.
- lift the engine using your jack, make sure to add a nice big strong piece of wood in between the jack and engine to spread the load bearing weight of the engine on the jack
- you will need to lift the engine basically as high as it will go before you push the engine through the transmission tunnel

- The left mount, has an L shaped plate which is bolted to the engine block, to make removal easier, these need to be undone 14mm bolts ( what a PITA it is to undo, wait until you have to do them back up...)
- the mount should drop out with a bit of twisting as its fairly broad and it will hit against the block and chassis plate
- Once out drop the new mount in, making sure you have it position the right way. There is an arrow on top of the mount showing you the right way.
- then front the top under the hood put the top plate on the mount and just put the mount nuts on a few threads
- Next is the painful task of putting the four bolts back in. This took me a while to master as the two top bolts you can barely even see. I managed to get the top two in from the side ( under the hood, just above the chassis rail ), I went in blind but going from top to under the car I managed to guide the bolts in with the socket and small extension and a bit of blue tack on the bolt head so it wouldn't fall out

- The bottom two you can get in by hand and tighten them up at the end with the spanner.
- Carefully lower the engine back down making sure all the engine mount studs on both sides align up.
- Tighten the nuts on the engine mounts
- Tighten the nuts back up on the transmission mounts
- Your done.
In my opinion, if your not real mechanically minded, don't do it. I am relatively mechanically minded, having played with Patrols 15 years ago and also prime movers, I was confident in doing it.
Also have a backup plan if it turns to shit and you can't get the mount back in. Also if you have a mate that can help it would make things easier as I found myself constantly going from underneath the car to under the hood. An extra set of hands for have been handy.
Cheers.