Just like with hacking, it's all about practice. When you're programming for the first time, you have no idea what you're doing. When you give a talk in front

Just like with hacking, it's all about practice. When you're programming for the first time, you have no idea what you're doing. When you give a talk in front of an audience for the first time, you have no idea what you're doing. If you've done it 5 or 10 times before, it becomes less intimidating: you know what to expect, and while you may not be 100% confident in your abilities, you will be confident enough to give a decent talk without feeling too embarrassed.