Any guy who's had to change the coil springs in his vehicle knows the potential hazards involved in doing this job. What can make the task even more hazardous is when there's no weight on the vehicle.
For example, trying to get the springs to compress with a floor jack is next to impossible when there is no engine, sheet metal or anything on the frame. I'm always afraid that somehow the spring will come become uncompressed half way through the process, fly out and hit me in the junk! Maybe an irrational fear, but fear nonetheless.
The best way to do this safely is to buy a coil spring compressor tool. I ran down to the local Auto Zone and bought such a tool, only to discover it was the wrong one. Damn! After another trip and an exchange for the right coil spring compressor, the front end of my 58 Chevy truck was assembled in no time.