Make your job good. Take responsibility. We all hear these principles very often from blogs, books etc. But it happens that sometimes we make mistakes. Some time ago I took a project that I couldn’t complete in time. Everything finished more or less good, but the situation was not comfortable at all. And that time I remembered a “who cares” principle.

If you said that you will do something or you are obliged to do it - who cares that you were not able to complete it?
Feel responsibility! It’s on your shoulders! Do everything that you can to complete the job, and if you see that you are not able - tell about it a day before, but not after! Because in the end - nobody cares of your problems!

Just ask yourself sometimes, and it can help you.