what you do is... remove the lower ball joint from the spindle.
i usually leave the nut on anwack it with a hammer.
once the ball joint is loose... let me back up for a minute.
first support the truck on jack stands, and use the floor jack under the lower a- arm..anyway once the ball joint is loose release the floor jack and the spring will push down on the lower a-arm usually releasing it from the truck safely[you may have to push down on the lower a-arm a lttle bit to get it out completely]
i have done this several times and it works for me.i don't like to use spring compressors because they are more of a pain than they are worth. good luck