Stock market doesn't care who you are and it's certainly not there to help you. So expect no mercy from it; in fact, think of it as something that is there to take away your money, unless you take steps to protect yourself. You can fret and sweat over losses caused by taking excessive risk; you can also torture yourself about selling too late or listening to your advisor or friends, or indeed not listening to them. In short, you can be sorry about so many things in so many ways. These are lessons that growing retail investors will have to learn. The market is a place where anything can happen.
Making profits in shares is not in your hands, but avoiding mistakes is definitely up to you. You cannot always control what you get. What you absolutely can control, though, is what you do. Effort creates value, and is an essential part of life. Though it is not always easy, and sometimes fails to produce the desired results, it is always worth the trouble. It may be complicated, yet that complexity will compel you to learn new and valuable things.
You should never invest in something over which you lose sleep, you are also guaranteed never to see any return if you avoid the market completely and never take any risk.