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I did some blacksmithing & metalwork for a couple years a while back when I was into medieval reenactment. Fun. We used a coal forge, and coal may not be something you have access to, but a well-designed rocket stove burning wood will reach the temperatures necessary to shape metal, and if combined with forced air, possibly even forge-weld.

Hang onto your used motor oil. In the movies, the smith always quenches hot iron/steel in water, but the truth is, if you quench steel quickly it will be super hard but brittle, possibly giving you a blade or a part that will chip or snap under use or shatter on impact. Oil holds heat without vaporizing, so it cools the steel more slowly and tempers it, giving it better strength. Clay cat litter is also good to bury the hot stuff in so it cools slowly.