It is just the same as asking if we can really afford to take a risk and lose money. If the idea raises doubts in our minds, the best thing is not to continue. We don't want to be like those traders, and despite knowing their capabilities, they force themselves to do it.
If we want to succeed, we must also set our minds to trusting ourselves more than we trust the market. We know that trading is not just all about money and capital but also about our thinking. If we believe we can do it, then that is the time we pursue it. Or else, rethink it.