Some time ago I came to the conclusion (quite unoriginal - but I went to him myself! :)), That, in principle, some mechanical systems and technical analysis can not eat. Indeed - even the most simple system, based on the intersection of price and moving average of almost any length, gives a very decent results by trapping long trend. However, the practical results are worse than many traders even such a primitive system.
Of course, much depends on the discipline of the trader and its ability to resist greed and fear psychosis ridden on the market. Some important points to help in this difficult matter collected in the "Clever ideas of clever people" -> "General rules for traders" and scattered in a number of other articles of the same section. There is a direct sense to print them out and hang in the workplace for daily reading; Strangely enough, these are the most common thoughts and the situation is very helpful in everyday work.