rear spring

Just bought my DRZ a few months ago and I love it. I use it to commute back and fourth to work. I started out on a Dirt bike KX250F but I didn't get to ride it enough. Still have the dirt bike, ride it when I can but with the DRZ I can ride everyday NICE. At first I was thinking I should set the...

Help? I need a bit of help here guys, I need to swap a rear spring on one of my bikes and I am not sure how to do it. Can I do the spring just by unloading it with the adjuster? Or do I have to have a spring compressor to do it? Any one? Please? Thanks for any help in advance folks...