My own experience in the Technical Analysis as a tool for investment and portfolio management has been quite an adventure for my success ratio when selecting and investing in the stock via technical analysis was %75 while the returns varied from 20% to 50% on average on yearly basis and depending on the stock itself, without margin. And one needs consistency in the method applied when selecting a stock. It requires a successful back testing before implementing it with limited capital first and when the results come, increasing the capital. Proper money management techniques are to be applied rigorously with stop-loss levels as well as entry/exit levels for any given stock.