Answer:
The point of technical analysis is to properly identify setups where you historically have a high probability of success on any given trade, ideally along with a favorable risk to reward ratio. Psychic ability is an unrealistic goal from using charts, but skewing the odds into your favor is not. In order for a technical trader to have long term success, he/she likely will need to continually alter, tweak, and refine his methods, to compensate for an ever dynamic market. This website is a good resource for chart patterns and other helpful analysis methods.
http://onlycharts.com/