Snip a little and try it, then repeat if need be. No need to cut it all at once and find you've gone to far..

But,
Are you sure cutting the coils is even a good idea?
http://www.eatonsprings.com/CuttingCoilSprings.html

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-