Avoid examples which fall within your prior skillset. Do not give an example in which your work was incomplete.

I learned long ago that I'm in charge of my development. So, in order to continue growing as a leader, I'd have to step outside of my comfort zone now and again. There was an employee that didn't respond well to corrective feedback, and their attendance issues required addressing. Although it was intimidating, I volunteered to step in and handled it differently than my peers had in the past. I started by humanizing myself, confessing performing corrective action was my least favorite part of my job, admitting I no desire to be in that situation either. In doing this, they didn't feel alone or victimized. I approached the rest of the conversation as a member of a two-person team. We strategized solving their attendance issues together, and they understood my intentions as helpful. Their attendance issues self corrected, and I took over their mentorship and performance reviews from there on.