Hmmm, pretty much what Phil said... It fairly easy to remove the spring. I've done it a number of times but simply jacking up the rear end and un-bolting the the shocks and simply use a crow bar for leverage to get the spring out. The spring has never come "shooting" out to be dangerous.
But I guess you can do what Eurostyle suggested but it so much more work.
Yamaha R6 + 07 Alpine White e92 + 99 Techno Violet e36