Failure is seldom an option. Yet, it does happen.
As you start a new position, you need to learn that job and all the ins and outs that go with it. You need to start some projects and actually see them through to fruition. It is good to know what success feels like and how to handle success.
You also need to know what it feels like to fail. You need to know how to pick yourself back up and move on. You need to either try again and succeed or understand why the failure occurred and how to avoid the failure next time.
The lower you are on the ladder when you fail, the less painful failure will be. The higher you are on the ladder when you fail the far more painful failure will be for both you and others affected.
The better you understand your job, the better you will be.