I recently replaced the front strut inserts on my mothers car. Absolute pain in the a$$.
Her mechanic wanted $300 to do the same job so I volunteered to do it for her.
I have press and a big vice mounted on a steel plate. I clamp that vice in the press. I use the vice to grab the big nut holding the struts in.
It's also a good way of holding the strut assemblies so you can work on them... Compressing the springs is always a pain.
All in all it took me a full day. It's just a bad job but we don't get snow down here so the nuts were easy to get off.
As I'm getting older I'm thinking of getting a torque multiplier.