Do yourself a favor and purchase or rent a large power impact wrench. I struggled with removing the Godzilla sized bolts on my shocks and finally rented an air-impact wrench capable of 1,100 ft/lbs torque. It still wasn't quite enough for two bolts and I ended up heating them with a torch and using the air-impact wrench to remove them. This ain't your generic Ford or Chevy your working on here.
BTW I purchased Monroes and have been very happy with them. Other than the fasteners I don't remember having any problems installing them.
Steve