Firstly, thanks to Scott for a few pointers (as usual).
It really is pretty simple - the hardest part for me was putting it back togather!
1. remove the 4 screws from under the wheel/dash
2. The and bottom plastic cover can be detached. The just pop off.
3. remove the right stalk by pressing in the clip (there's a corresponding one on the bottom of the stalk as wel)
4. remove the left stalk. Same deal as the right stalk except you need to unclip a wire harness. Use a flat blade screwdriver to press down the clip to undo the harness.
5. undo the bolts which hold the instrument cluster to the dash. There are 4 bolts - two front and two back. Funny thing was I was missing a bolt - which is not surprising and confirms
that our cars (and most imports) are f**ked with either here or in Australia. Someone must've changed the dash and forgot a bolt
6. Take the plastic cover off the ignition barrel. remove the two large harnesses which connects the instrument cluster to the car on the back. The whole dash/cluster should come out now.
7. There are 4 screws (two front, two back) which needs to be undone; then undo the clips (there's a few of them) and the cluster should seperate from the dash.
put in your nismo cluster (or if your a dodgy prick...another car's cluster )
Then reverse the steps above to fit it all back.
Hope it helps!