Do all the shaping to one , get a nice sharp filed edge on it then heat it red til it won't hold a magnet then quench it in oil. If your file doesn't sharpen the edge as easily as it did before you've successfully hardened it. f theres little or no difference then I'd skip the hardening part and make a few to shoot into the ground just to see how they hold up.
I killed my first primitive archery deer with a tradepoint made from the steel band off an oak barrel. WAY too soft, but it chopped the top of that little button bucks heart to pieces!