Now is definitely not the time to be modest about how great you are! Someone is curious about one of your recent accomplishments, and they want to know more details about how you did what you did. If you downplay everything, you'll sell yourself short. So be up front and honest about how hard you worked. Don't worry, it won't come off as egotistical. It will come off as intelligent. You know how to tell it like it is without coming off too cocky.