Replacing Stock suspension?

Ok, my girlfriends Cavy bounces and sways all over the place, and frankly, it's getting dangerous.
So I want to replace the suspension, but I dont know where to begin. Is this a simple bolt-on procedure? Will I need to fuss with spring compression?

Also, before I can start anything, I need to find a stock suspension kit. Any good sources for OEM suspension?

If I sound like a total noob, feel free to school me.

-Mr Mook

You might as well do the whole shebang... New strut mounts, struts..

There are ways around not using a spring compressor, but if you don't know what your doing, i highly advise you not to. 2 bolts on the front steering knuckel, 2 nut and 1 screw on the strut mount. For the rear its 2 bolts and 1 screw from the top, and 1 18mm bolt from the trailing arm. But please for your saftey, useing spring compressors before taking the center big nut off.