Likely the only bushings that you need to worry about are the 4 cone shaped bushings where the radius rod connects to the outer end of the control arm. easiest to remove the bolt at the rear of the radius rod after removing the front bolt. Remove the entire radius rod. Clean out the old bushings - may take a cup brush in a drill if badly rusted into the control arm. Be sure to get the new firmer (and longer lasting) bushes (available at the dealer). Re-install is reverse - but leave bolts loose until suspension is fully loaded and settled (bounce car and wiggle steering back and forth). then reach under and tighten without jacking the car.

At the same time, I recommend that you replace the upper strut bearings (bearing is separate from the mount), and consider installing the lower chassis brace (2 minutes - one nut and three bolts - one stud and three threaded holes already in frame) that spans the frame rails at the radius rod mount pads. Volvo part - get the hardened bolts and nut from them also.