No one person has all the skills, knowledge, or the complete understanding of everything that is required to successfully run and grow a business. It's just not humanly possible. It doesn't matter if it's a small business or a larger business. There are too many complexities to address.
Accepting this premise from the beginning increases the likelihood of your growth and your success. Acknowledging this is a strength, not a weakness. It means that your ego is in check and your goals are to serve your customer, first and foremost. And let's be honest, serving your customer well, is what makes a business soar.