Larry,
It can be hard to find a file wide enough to do as the 3Rivers video for snuffers. Instead, file across the 2 flats of the BH. Start at the rear and in one swipe file the flats to the front. Rotate on each pass. This step is to make the flats true - very important. You won't begin an edge until they are true. If you have some KME stones or similar pull the head back to front tip towards you, again rotating on each pass. Start with a coarse stone and progress through grits. Afterwards if you have apiece of lether strop the same way. Put a little grit on the leather - flitz polish, toothpaste, etc.
Another method I use is first a file, then a 3 sided Jewelstick, finally a sharpening steel - all across the blades.
Remember, the most important part is trueing up the blades to start. After that they sharpen up very easily.