I am assuming that the front brake setup for the LS is the same as the SR - if so, removing the front rotors is not so straightforward. You will need to remove the front hubs as the rotor is attached on the inside face. The rotor is held in place by the wheel studs, so these will need to be pressed/hammered (carefully <img src="/forums/images/graemlins/wink.gif" alt="" />) out first.

The rears are simple - but make sure you soak the retaining screw in PB Blaster (or equivalent) first. Make sure the handbrake is released and use 2 bolts in the holes in the rotor to "push" the rotor off.

Cheers <img src="/forums/images/graemlins/smile.gif" alt="" />