For most of us, the towering challenge in career building is the fundamental contradiction imprinted on our workplace behavior by our beginner experience. Square One can be so difficult that some people never fully get through it. For those who do, applying its lessons can block further growth.
This is how it works: We first must learn the skills and practices of personal productivity. That means we work on how to order our days through time and priority management while we learn how to do the job. Then we must learn when and how to suspend certain of the personal skills in order to rise to become responsible for the output and skills development of others. That requires concentrating our attention outwards, working to understand and influence others. For example, building effective working relationships is not at base a matter of efficiency.
The first step, personal productivity, is very difficult to even understand, then to learn. It requires a lot of practice, and trial and error.