I was always taught to keep my head down and work. I followed this for years. However as I am pushing myself outside my comfort zone and analyze life and people through a different lens, that approach doesn't work all the times.
One of the things I learnt from Richard Branson's quote is to say 'YES' to everything and then go figure it out how to get it done creatively'. I am in a complete agreement with it. One, however, must be careful since this could go against you in certain situations.
You should learn to equally say 'NO'. Some might get offended and others would appreciate it. You must be clear on what you want and stay firm on it. Don't let others take advantage of you.
A good leader would always stay humble, listen and act thoughtfully.