Place your floor jack under the lower a-arm, then jack it up high enough to take off the upper spindle bolt. Make sure you have the jack stands under the frame, and be sure that you don't lift so high that you lift the frame off the stands. Very slowly, lower the jack down until the spring is free. Replace the spring, raise, then put the upper spindle bolt back on. But i would use a spring compressor to remove and install IMHO to be safe. if anyway possible to get one in there. JMO You will probably be better off using the spring compressor on installation of the spring IMHO.