If any of you have Herb Adams book "Chassis Engineering" look on page 33, Adjusting ride height and lowering. I'm quoting some of his remarks.
"Before you invest in springs to lower your car , you should be aware that your chances of success are much better if you simply cut your existing springs."
The remainder of the paragraph explains why. In general new springs will settle and you don't know where the car will settle. In his next paragraph;
"This is why I recommend you cut your existing springs and save the cost of new springs. The results will almost certainly be better. Your car's existing springs have already taken a permanent set, so you know where they will end up."
If you want to lower a car 1 inch you don't cut an inch off the spring, you need to determine the spring lever ratio to determine how much to cut the spring for the desired ride height. It will change the spring rate a little if any part of the live coils are cut but not enough to be a problem. Cut springs are no more likely to fail than a new spring. I have done it on some cars including circle track race cars.
Tom03es and cbrcrx are correct, it's not a big deal and it will work if done correctly.
Clifton