By making price predictions from time to time, it will certainly help make predictions more visible and where the market will go.
This is a better to learn how the market works also. It will build your confidence on how the market works and with time if it is done consistently, it can make you understand a bit about the zig zag price movement. Continuous learn and reading of books about market trend will contribute to comprehensive market movement.
Every trader has their own way of reading where the market is going so for those who claim that some ways will work, it's not necessarily and it's uncertain.
Since there are different tools that can be used to analyze the market then different strategies can be put together to get things workout for market predictions. To analyze the market there is need to use both the price action and normal indicators out together forming a unique strategy.
Mistakes will provide experience to be corrected in the future, as a trader must be able to adapt in every condition.
We all tend to make mistakes and all we could do is to try out best to speculate the market price movement and if it falls to our direction, that's fine and if not we keep going.