At the beginning of any great journey, you take one more step. At the end of every small journey, you take one more step. The beginning and end of everything is just one more step among many in our lifetime. Each step should be treated with the importance of that first and last step.
You fear doing great things because you may fail. If you never begin, you have failed. If you never end, then you are closer to enlightenment.
Yet, how can one face the monumental task of doing something, changing something, becoming something?
Take one more step. Treat every part of the progress as you do walking.
That seems to downplay the importance of the task, no?
Walking is a complex action of balance, coordination, and endurance. Think deeply on how complicated walking really is and you will grasp it. Then realize how you have made such a difficult task mundane, by taking one more step.