Cut Hexagon papers at the size of your choice.
You can find them easily downloadable on the net.
Or you can buy them ready in quilting shops.
Put one hexagon paper on a plastic or cardboard and cut it 1/2" larger.
If you use transparent plastic, you can center a subject on your fabric.
Put your plastic template on your fabric on any side, it does not matter.
Draw a thin line all around.
Cut on the line.
Take one of your paper templates and place it on the WRONG side of your fabric hexagon.
Fold one side and attach it with a paper clip.