An ancient prophet gave the assurance that God would require nothing of his children save he provided a way for them to carry out his commandments.
And it came to pass that I, Nephi, said unto my father: I will go and do the things which the Lord hath commanded, for I know that the Lord giveth no commandments unto the children of men, save he shall prepare a way for them that they may accomplish the thing which he commandeth them.
We can rely on that promise and pray for divine guidance. Speaking of the Lord making provision for the carrying out of his commandments, remember that in ancient days he required that the gospel of the kingdom should be preached to all the world. When this commandment was given to the founders of the Church, perhaps it seemed to be an insuperable task, but God has kept his promise and Christianity flourished until all his Apostles were killed.
Source: 1 Nephi 3:7; The Book of Mormon: Another Testament of Jesus Christ