Just start at the beginning.
My son learned a great lesson last week after going to work to find he had to mind the shop by himself; everybody else involved had dropped the ball. After a quick call to The Wife and her encouragement to carry on, he was all alone. What he learned is that he is just one man and he can only do what he can do. He did his work, kept the doors open, and the world kept turning.
It doesn’t matter if you’re moving a mountain of bricks or just a few: It’s only going to go one hod at a time so just get on with it.