Trading is unpredictable and I think that its something that is also based on luck and cannot be done on a easy way too.
Its not easy and trading is also very risky sometimes due to the luck that it requires, the market is changing every minute...
The difficulty of trading strifes from the fact that is very difficult to make consistent earning over a period of time, since sometimes your analysis will be wrong or luck will not be on your side then you can lose some money and now you are in the position to try to recover your losses.
That's right its impossible to predict anything accurately every time as many times you will be making a wrong move which will result in loss and that makes trading very risky place.