Leaders cannot do it alone, although some certainly try when no one else is stepping up, identifying the need for delegation.
As a leader, you will require vision, collaboration, anticipation, alignment, knowing that performance = people, and the ability to interpret situations to make critical decisions.
Leadership coaching, in short, will identify that you need a team that you can lead, and those team members need to feel safe so they can go to work with you, not for you.
You work for your staff, not the other way around!