The most important challenge that people face when learning to manage their personal resources is learning to delay gratification. People tend to want things that they would enjoy right away instead of waiting and being able to get more enjoyment in the future.
In terms of personal resources, this tendency shows itself in a lack of saving. People tend to buy whatever they want, whether they can truly afford it or not. They tend (at least in the US) to forego saving money for their future so that they can buy things that they want in the present. This lack of discipline is a major challenge to people as they learn to manage their personal resources.