Remove the tire, wheel and brakes until you have just the spindle staring at you. Remove the cotter pin from the lower ball joint and unscrew the nut until the top of the nut is even with the top of the ballstud that it threads onto. This will leave a space of maybe a 1/4' to 3/8" between the bottom of the nut and the spindle boss. Now, rap the spindle boss on the side with a nice, big hammer. It may take several raps for the ballstud to free itself from the spindle boss, but it will come free eventually with a pretty loud bang. Don't worry, the nut will catch it. Now that the ballstud is free, install your spring compressor and tighten it down until all tension is off the spring and you can rattle the spring around in its mounting. Now, you can finish taking the nut off the ballstud, drop the lower control arm and remove the spring with the spindle still fastened to the upper control arm.