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Plan in advance and communicate with your team, suppliers, clients on constant basis.
Make sure everybody in your team knows what they are doing and are aware of the deadlines.
Keep a list of To-Do things and cross them off once they are fulfilled.
Don't try to do everything by yourself - trust your team. Your main task is to coordinate and manage.
If something goes wrong, don't panic and blame yourself or your team. Instead use precious time to fix the problem.