I'll go ahead and post this for all interested.
When laid flat, all reeds should have a little curve to them. The side that curves up is the top side of the reed. Most reeds are different on the ends. the narrow end will usually blow clearer and the wide end will usually blow raspier. Take a very sharp knife and, starting in the center on the top side of the reed, scrape towards the end of the reed. I usually shave the center 1/4'' going length ways and then on the sides turn and go from the center of the reed on an angle strait out toward the edges.
The amount to shave off may be one of the widest disputed things on the planet. I'll say this, don't shave enough and you won't be able to tell that you did anything. Shave too much and it will be way too raspy and the reed will split very easy. We normally shave about 1/4-1/3 of the way through the reed.
After you shave it, clean the burr off of the edges using a piece of emery cloth.
You may screw up a half dozen before you finally get one right, but that is how to do it in a nut shell.