Usually, the vents pop right off, some pieces have screws. You kinda have to look around and feel to see. I use regular vinyl/fabric paint. clean the pieces good first, let them air dry, then you can either prime or sand the pieces, then paint the pieces, clear coat them to keep them clean and let them dry for at least 24 hours so you won't chip them putting them back in.
Here's a pic of my car:
<img src="http://www.angelfire.com/hi5/ephereal5/mycivic.jpg">