Step 1: Get amongst it
Begin by flattening out your chosen fork with a hammer. Next, pull the middle two tines up to make it easier to cross the outside tines behind them. Do one outside tine and then roll the tip around before crossing the other side over and rolling it. When finished they should form a heart shape, you can tweak them in the vise a little to bring them closer together.
Next, we want to bend the inside tines outwards similarly to how we bent the outside ones inwards. Curve them around the outside of the first two, and then put a little outward scroll in the tip of each one for good measure. Now congratulate yourself, the worst is over!