Learning to lead has been a huge process over the years. And I do not think there is ever a time when that learning stops.
In thinking about mistakes that I have made, one of the biggest has been the failure to address conflict quickly. My tendency has been to hope it will go away. The unfortunate thing is that it usually does not. The mistake is not dealing candidly, graciously, respectfully and immediately (Proverbs 17:14, Matthew 5:9, Matthew 18:15, Ephesians 4:15-16, Romans 12:17-19) .