Very important, my loves. It will make your hair cutting lives much more fun and less frusterating, I promise. (And a lot more bloody if you are not careful. Take it SLOW with newly sharpened shears. Trust me.) If you are a casual DIY hair cutter, you may want to sharpen your shears once a year or so. You can either send your shears off to be sharpened at http://www.customsharpening.com/, or you can attempt to DIY by watching this video. Good luck!
Here is a good pair of starter shears
to buy for your DIY haircuts.