What do you have on there now?
do you have the SLS shocks and springs?
its fairly simple as long as you have the right tools. I have had to change the rear shocks twice now. The SLS was easy because the spring is so flimsey. but the KYB struts and springs were a little tough, they are much heavier and stronger.
heres a couple of tips:
There are 2 bolts that hold the lower part of the strut to the Hub. The TOP bolt may be a camber adjutment bolt. It might look like this:
http://www.porcupine73.com/pics/suspension/camber2.jpg
so make sure this bolt goes back in the top mounting point.
Be careful not to drop (or rest) the strut on the ABS sensor and wires
you may need to disconnect the brake lines if the shocks you have on there are original. alternatively...... (its a bit of a bodge!) cut the brake line bracket with a Jr Hacksaw to remove it from its mount. then just cable tie the brake line to the new shock.... this saves bleeding the brakes
when youre done drive around for a bit then measure from the centre of the hub to the bottom of the wheel arch. it should be equal on both sides (flat level ground + nothing in the boot) - I think it should be 17.5 inches as standard
hope this helps a little
Fraz