Lift the car with the jack, and support it with jack stands under the frame. Remove the wheels.
Place the spring compressor on one of the coil springs and use the ratchet handle and socket to compress the spring. Remove the spring from the vehicle, following the directions in the service manual. Release and remove the compressor from the spring, and repeat the procedure for the rest of the springs.
Cut one coil off each spring, using the cutoff tool. Make sure to cut the same amount from each spring.
Grind the cut end of each spring with the hand-held grinder to eliminate any sharp corners.
Compress and re-install the springs, following the directions in the service manual. Replace the wheels, jack up the vehicle, and remove the jack stands. Lower the car from the jack and check the new ride height.