its piss easy mate.
jack up one side.
undo the locking nut at the rear or the torsion bar, 17mm i think and loosen off the torsion bar adjuster till there is no tension on it.
undo 2 14mm nuts and 1 24mm nut at the front end of torsion bar. slide the bracket towards the rear which will allow the torsion bar to swing down where it can be pulled forwards out of the rear bracket.
fitting is in reverse.
lower car and roll back and forwards a couple of times to allow suspension to settle.
measure the heights and adjust to the height you want.
make sure your torsion bar adjuster brackets are sitting up level with the cross member out of harms way, you may have to pull them back out and reindex to get it right.
all easy to do, just a bit of mucking around to get it set at the right height if your not lucky enough to have it fall into place first go.