Fear is natural and in any case you have to face it. Before jumping in a trade it is essential to be prepared for the unsystematic risk, which is always there.
The important thing is time management one should focus on the entry and exit time. Only get into a trade when you see blood in the streets and it will work for you.
Fear is human nature and I agree it is very natural. But don't let that fear overwhelm us, that's actually the real problem. As you said that we must be able to control the fear that we feel. How to overcome our fears, namely by increasing knowledge about trade or investment. The more we have a lot of knowledge about what we are doing, the more we can control our fears. That's what I've experienced so far and made me a better trader or investor.