I've found that it isn't a matter of courage. If you wait for that, you'll never get there. As has been mentioned, you just need to do it. There won't be the thrill you get of thinking about it the whole time you're jacking off, it mostly just becomes an intellectual exercise. When I manage to get the job done, there's a matter-of-factness to the proceeding that belies the excitement and passion I feel while I'm convincing myself I'm going to do it this time - before there's a white puddle in my hand.
Well said