Быть директором школы сложно так как нужно управлять школой, нанимать и увольнять преподавательский состав, обеспечивать школу оборудованием и следить за состоянием учебных корпусов.
Be the Director of the school is difficult because you want to manage the school, hire and fire staff, providing school equipment and monitor the academic buildings.
Being a school principal is difficult as it is necessary to manage the school to hire and fire teachers, provide school equipment and monitor the condition of school buildings.
to be the director of the school's hard so as to run the school, to hire and fire staff, ensure the school equipment and monitor the status of the training corpora.