They need to be crafted in a vanilla workbench. You can do some attempts in a test world. Or if you don't want either - there is a safe way to craft them, which is 1 diamond for a nugget (these are stable, just like the ingot you create from these), so it's 9x expensive for an ingot.I think the unstable ingots would blow up before I got a chance to craft it... I'm not that nimble.
There's really nothing to be afraid of, even if you die - you'll learn and won't have any problems in future.