It is not only about managing risk and discipline when someone starts trading, but the person must also be able to maintain their mentality not to be greedy when they have made a profit and must be more patient when they have not made a profit. This means that trading is very simply not difficult as long as someone is willing to learn diligently and not push themselves too hard when they have lost or when they have not found their profit in a short time. Because every right approach will always provide a better way so what you convey is not wrong at all in this case.
They are all working together because you actually need something to be alright because those are the factors that will help you grow in the industry because when you don't manage your self first because it is when you know how to manage your self that you will be able to manage your resources.
Because you need to be mentally prepared before you start trading because it will drain you so you need to be prepared for things like this and even when you don't have patience then there is a big problem because everything have to be done accordingly because there are things that you can learn and when you are implementing all this things you have learned then you bring them to the picture because most people forget about this basics. And this is what will actually help them and they choose to neglect the whole process.