If you find items to be delivered elsewhere, put them in specific place and deliver them there only when you're finished with your present task. To Do Focus on your specified project. Resist the urge to be distracted by what you eyes see. Instead, like a boomerang, let your brain keep guiding you back to achieving your immediate goal. Put other reminders in an action file and do them when you're finished with this task.
Many people are reluctant to delegate.
Empower yourself with these strategies to most effectively use your support team - peers, employees, supervisor, assistant, etc. Never delegate tasks that are not essential and should not be done at all.