Make a profit, invest in moderation. Evaluate your financial situation, and invest moderately without affecting your normal life. Imagine if you woke up one morning and found that your investment situation was a mess, the losses make you unable to pay the bill for the next month? If so, then you have invested too much. There is no doubt that investment failure will always hurt, but if you invest properly, even if the worst happens, it will not be a devastating blow to you.