If you are going to use a hack saw and files, you probably will have to anneal the piece in order to soften it enough to cut. If you can cut it without annealing, it might not be high carbon steel.
You can do a make shift anneal by building a fire and heating the piece and then covering it with the coals to cool slow. Then you can cut and file it to blade shape. After that, you have to re harden it and draw/temper it to the right hardness. Then it's ready to test and handle.