Yeah, that's difficult. The only answer I've found is experience. Gaining experience for yourself is painful because it's slow, and part of the experience is co

Yeah, that's difficult. The only answer I've found is experience. Gaining experience for yourself is painful because it's slow, and part of the experience is consequences of your mistakes: in fields like fire-fighting (or rock climbing, which I love) your mistakes can literally kill you. So hopefully you learn form other people's experience and mistakes as much as possible.