Exaggerate the lizard brain, the fear. Make up visualizations of embarrassment of potentially career ending moves. See the worst outcome possible, and then intensify the big failure even more.
Hyperbolizing fear reduces its preventive impact. Deliberately over-thinking about negative outcomes undermines fear. Scared becomes funny and ridiculous.
Put fear in its corner by embracing its negativity. Give in to get out. And then go for it. You’ve seriously got nothing to lose.