Stand behind a garbabe can while wearing a motorcycle helmet, or you can also rent an armored car and stick a pole out of one of the gun ports to pry the spring loose.
Seriously, though, it can go flying if you aren't careful. You're pretty safe if you just stand toward the front of the car when you pop it loose. The easiest and safest way is to get a spring compressor.
------------------
351W 89 Mustang GT Convertible