It is up to you but I will tell you my experience with lowered springs, as they are shorter unloaded i was able to put my body weight on the spring and undo the shock nut and take off the spring no problem. I would not do this with normal springs!! I have seen someone brace the top of a shock and undo the nut with an air gun, the strut flew up in the air and into the windscreen of a car in the yard, funny as fook.
You could then rotate the top ruber by the amount needed and then lean on the spring again and bounce and get the thread started then use a spanner to finish it.
As a guide as to where the rubber needs to be rotated to, the top mount "with the 4 bolts" only go into the turret in 1 direction, if you make a note of which way they face and do a mock up with the spring loose making sure the bottom of the spring faces inwards, when you go to fit it back together you should be ok.
Now wait for everyone to say no dont do it lol.