There are no the best advisors. All of them fail in the long-term but if you are lucky even wrong indicator can generate a random profitable streak and make you think that you made right purchase. If you want to avoid such silly mistakes make sure you did proper backtesting and it gave you satisfactory out-of-sample results.
If you want to trade, you have to apply proper knowledge. If I want to do expert trading, I have to follow Money Management and Risk Management. I have to manage risk to survive in trading.