You have to remove the spring and the plate it rests on. The proper spring compressor is available for rent from members of this forum. Check the DIY section. Insert the plates at the top and bottom of the spring. Use vice grips to hold the lower part of the spring to the spring plate. Insert the threaded rod through the top of the upper spring perch in the engine compartment. Screw the rod together until the lower points of the rod mate with the dimples on the underside of the lower plate and the upper plate contacts the upper part of the rod. Screw the rod together using a 1/2" drive ratcher, never air tools, until the spring is compressed and you can remove it. The use of vice grips will become apparent, the spring will rotate.
Since you want to replace those bushings, I strongly recommend replacing the pair of large rubber bushings in the L shaped bracket and the bushing internal to it, at the other end of the rod, on both sides.
Check the ball joints and if necessary replace them too. the uppers are fairly easy, the lowers require a special tool. Take the spindles to a repair place that has the tool and get them pressed in.
To remove the spindle, remove the rotor/hub and caliper. Don't let the caliper hang by the hose. Bend a coathanger and use that if necessary. Undo the joint first and use a large puller to seperate it. Then, undo the bolts for the steering arm, pull the top of the spindle towards you and use the puller to pop the lower ball joint.
The upper control arm/ball joint on the drivers side is a PITA, the bolt must be removed towards the brake lines and booster. There is not much room. Some others, including me, insert the bolt from front to rear.
Check this thread:
http://www.peachparts.com/shopforum/showthread.php?t=130972
or this one:
http://www.peachparts.com/shopforum/showthread.php?t=91934