Please turn to I Chronicles 28, verse 20. Now David advised Solomon not to be frightened by the size of his task as king and builder of the Temple. Fear can immobilize us. The size of a job, the risks, and the pressure of the situation can cause us to freeze and do nothing.
We can broaden that principle and realize that what God is saying to us with that is He will not leave us nor forsake us until He has finished with us in whatever He has in mind for us to do His work. And so it is the same principle there as we have as a guarantee ourselves.
One remedy for fear is found here, do not focus on the fear. Instead, get to work. Getting started is often the most difficult and frightening part of the job.