I have an old-school brake line flaring tool that I've reluctantly used what seems like 1,001 times to flare 3/16 steel brake line. It's the inexpensive one available at the parts store with the wing ...
Without proper experience, bending your own brake lines can be a daunting task. There's little room for error, meaning if you're not super accurate with your bends, the line probably won't fit up ...