remove your standard rear bias valve, If you have a jap car they are seperate from the front ones, aussie ones are together but you can bypass it pretty easily.
work out where you want to put the new one (engine bay, interior etc) I put mine on the tunnel next to the handbrake. Putting it in the engine bay where the original one was would be a whole lot easier to fit, but a bit harder to adjust.
that is mine installed.
not much more to it, just bleed it through and adjust it up.