There is a difference between knowing which direction the currency will go, and which levels is price likely to go reach
Technical analysis is there to help you enter and exit the trade by identifying key levels.
Before you even enter the trade, you should have already decided based upon fundamentals, which direction the pair is headed.
By looking at the charts you are able to tell if there is higher risk entering at the current price as it is close to resistance or support levels
Secondly you can identify areas where you can buy back in if traders were to take profits and drive price lower
This will prevent u from entering at the highs, but instead wait for a pull back and enter from a price that you know the market has been buying from recently.