I just did the same thing on my car with the springs, I rented the strut style spring compressors. I took a impact gun and compressed on side of the spring, then compressed the other side. I bought some hose clamps, I made sure they were stainless steel. I put 2 clamps on each side of the spring, took off the compressors, sat the spring in place, jacked up the a-arm and put everything back together, worked like a charm and only took about 30 minutes
May not have been the "correct" way, but it sure as hell worked
May not have been the "correct" way, but it sure as hell worked