If there is an issue, it is usually where the front eye bolt passes through the bushing tube.  If the bolt is rusted to the bushing tube, the only way to remove it is to cut the bolt between the spring and the car frame, on both sides of each spring.  Easiest way I found, before I owned a sawzall, was to use a cutoff wheel to cut the eye off the spring, then cut the bushing off the tube, then cut the spring in the two aforementioned places.  Obviolusly a new bolt is required at that point. 

Use anti-seize between the front bolt and the steel ID of the bushing.

When I changed out my springs, one bolt had rusted to the inside of the front spring bushing.  I had no sawzall at the time so I tried my cutoff wheel.  There was not enough space for it to cut.  A friend had a torch,  so we cut it off with that.  It worked, but my garage was really full of smoke.  We also had a fire extinguisher right there just in case.

 New spring bolted up just fine and I lubricated it with something I had handy.  It's worked fine for about 15 years.

My advice.  Use a sawsall with a new blade.

The rear shackles were a hassle because of space limitations, but nothing was frozen.  I think I had to use an open ended wrench for one of them.