I took my 2005 Envoy SLT (144k miles) into the repair shop today and they said my radiator needs to be replaced (leaking). They also told me that my outer tie rods are loose and that my rack and pinion is leaking. I would like to try and save some money but I also don't want to get in over my head. Are either of these projects doable? I have replaced brakes, done tuneups, changed oil, etc. Which one of the two is easier? Thanks!