I would not recommend installing the springs yourself, unless you are experienced in suspension work and have spring compressors etc. There really isn't much to worry about except getting it done properly, by someone who has the experience an proper tools.

I would suggest you replace the shocks / dampers at the the same time, if you have the intention of doing it in the future... Might as well kill two birds with one stone...

Don't expect to see a drop in your car for a few days to a week, until the new springs settle-in...

The Eibach springs and Koni Sport damper combination really does make a huge difference in the handling of the car...

Also, after you do the suspension job, make sure you get a professional alignment and camber adjustment, as the modification will alter both...

You'll love the true sports car feel after the changes...