The scary part will ever be not even the part where you decide to begin, as Stephen King advises. It will be where you decide you have an idea you want to explore. When you decide you want to take a daydream, a random thought, and stretch it to a reading reality.
I want you to know picking an idea is scarier than actually writing about it.
It’s always going to be scary right before you start a WIP. It is always scary right before you put pen to paper. It is quite scary to start a new work! There is this mix if awe and anxiety and excitement. But sometimes that anxiety engulfs every portion of excitement.
But don’t listen to the anxiety! Don’t listen to it! If the idea is there, keep it! Save it! Work it! But don’t let it go.