It's really pretty easy. It just requires the razor and hone, a magic marker (sharpie or something similar) and a loupe or other magnifyer to help assess the edge.

You just apply ink to the edge - the whole bevel right to the edge. Then do a couple/few strokes on your hone, and then examine the edge. If the ink has been removed *right* to the edge then you are good. That means the bevel is contacting the hone properly. If however the ink is not removed from the edge, then you're experiencing what Hirlau described: honing the bevel's shoulder and not the edge.

It's basically a test to see exactly which bits of the blade are coming into contact with the hone.