I found this field and stream trick helpful to put an edge on anything. Try it out!
Step 1: You Will Need
A dull knife
You'll notice two sides on your whetstone.
One fine, one coarse.
Start with the coarse side.
Rest the knife on the coins like this. This is the angle that you will sharpen.
REMOVE THE COINS.
This is essential, because it can ruin the whetstone if you don't.
Keep the same angle that you had.
Slide the knife down the stone.
When you have done this about five minutes on a good blade, switch sides on the knife.
After five minutes on that side, switch the stone around and repeat.