How do I find the courage to do the hard thing at work?

You have already started, and you should not skip past that. The small acts of courage you are managing now are not nothing; they are practice. Courage is a muscle, and no one lifts the heaviest weight first. The big acts stop you because they carry real cost, and fear of loss is honest, not shameful. The truth is you will probably never feel fully ready for the big ones. Waiting for the fear to disappear is waiting for something that will not come. What changes is not the fear but your willingness to act while afraid, and that grows from doing smaller brave things again and again. So keep stacking the small ones on purpose. This week, choose one act slightly harder than you are comfortable with, and do it. You are not chasing fearlessness. You are teaching yourself that you can act anyway, so that when a big one comes, your hands already know the way.