Romans 12:3 says, Do not think of yourself more highly than you ought, but rather think of yourself with sober judgment..." I have often said that one sign of good mental health is the ability to do an accurate self assessment. Granted, we may not always like what we see, but a heathy person says, "This is what I am - whether I like it or not." They are honest with themself.
As you lead, don't be afraid to look at yourself or even have someone else evaluate your leadership skill and make adjustments where necessary. To make a false evaluation of our abilities may make us fee good for awhile, but it does not improve who we are or our leadership potential.