I have replaced the lower arms without removing the axle nut, one simply must not pull the hub outward once the lower ball joint is released.
I wired the hub back when the lower joint was released and all was well. Also be aware that the bolts are not tightened until you have the measurement in the manual which has the car sitting at normal height before clamping the bushes as this is to prevent premature degradation of the big hydrobush.

