No indicator is right all the time and you don’t have to be right all the time. Just be right a higher percentage of the time than wrong. Choose some reliable indicators and stick to them. Don’t follow some indicators for a while and switch to some others if they fail. Don’t be a technician in the first half of the year and a fundamentalist the next half. Be consistent and disciplined in your approach. Don’t abandon a good indicator because you think this time everything is different.
It takes of course a lot of guts because the opinions of the most widely quoted gurus of Wall Street are usually contrary to your indicators at that time. This is much easier if you don’t use margin. You will sleep a lot better if you buy fifty shares of IBM with the money you can spare than two hundred shares on credit.