In my recent employment history- I was hired to complete a project for an important and high-profile client. I was offered the opportunity to add other employees to my team for the job- but instead I chose to take the majority of the work on by myself- believing mistakenly that if I wanted it done right- I would have to do it myself. The workload proved to be too much for me. The project failed the first time around- and I ended up having to hire other team members at the time when I should have had the original project already completed. Together- we did end up bringing the project to completion eventually. Bouncing back from that mistake was a huge blow to my ego- but I have learned since that teamwork- delegation and working seamlessly with others is sometimes the best and only way to accomplish large tasks such as the one I was assigned.
Practice makes perfect when it comes to answering behavioral interview questions with good examples from your history. Try to prepare as many answers to a variety of these types of questions as you can before the big interview day comes.