How difficult is it to replace the front shocks on the e28 M5? Do I need special tools? I have never done this before but am eager to try. Is it a bad idea to jack the car up with the jack on the subframe? What shocks are recommended Koni vs Bilstine?

The ride is currently harsh and undamped when hitting small holes and cracks in the road. The front end is in good shape with a new drag link installed. All other components are sound. I think the existing shocks are Koni and may be adjustable. The steering is a little vague unless I am actively steering and cornering. Could this be a symptom of bad shocks? When I do a "push down" test on the front I can barely get it to move, maybe an inch or two with approx 150lbs of force.

Thanks for the help!