You can get it done by any professional in your area, google is your friend on that front. If you wish to do it yourself you can watch some videos on whetstone sharpening and buy a set of quality whetstones, there are a few electric sharpeners as well that aren't too bad but they do take more material off the blade. The tungsten bladed sharpeners that cut a new edge are fine for cheap knives but will ruin your good knives quickly as they take off way too much material and do so unevenly.