get a spring compressor , remove shock, compress spring remove lower control arm with spring and release tension on spring, use an air chisel to drive out bushings and press new ones in. remove upper control arm remove bushings with air chisel and press new ones in. reinstall upp control arm, comperess spring and reinstall spring and lower control. reinstall shock, alow while arms are out or disconnected use wire to hold spindle in place so not to break brake hose or sensors if any are there. get front end alignment after install is complete.