If you are replacing them, then screw it. Angle grinder with a cutoff wheel to the shaft. I don't even bother with the nut now, I just hit it with the plasma cutter immediately.
The bare minimum tool required is an impact gun. The holding wrench provisions are never sufficient to use hand tools to get the nut off. The best technique is to do a fresh oil on the impact gun, then run the compressor down to kick on, so that it goes to maximum pressure for the initial impact hit. Support the weight of the car on the control arm itself. This relieves the seat pressure on that nut. It also keeps control arm from flying down when the strut comes out and violently ejecting the spring which can remove a limb if you are standing in the wrong place.
Kurt