Romans 12:3

For I say, by the grace given to me, to everyone who is among you, not to think more highly of himself than he ought to think, but to think soberly, as God has dealt to each one a measure of faith. (Romans 12:3)
For this verse I will just leave these questions, and hope to be able to see your answers.

What does it mean to not think more highly of yourself than you ought?

Can you take the idea of humility too far, and leave yourself unable to use the measure of faith dealt to you?

I look forward to reading your answers to these questions.