Go straight forward! and learn in the progress

don't be afraid of mess up. just make the best judgement at the time based your ability, information, and your preference.

management experience can only gain from the day-to-day life. you just go through it, and the life will teach you lots of useful lessons and techniques.

For your particular question, why not assign another person (report to you) to work on that "低級活". Kowning how to delegate is one of great aspect of goodmanagement.

Take some management training courses, it helps in the long run.