When called by the Lord to preach repentance, Enoch felt inadequate. But the Lord promised He would be with and help Enoch succeed in his calling.

Moses 6:31–34

31 And when Enoch had heard these words, he bowed himself to the earth, before the Lord, and spake before the Lord, saying: Why is it that I have found favor in thy sight, and am but a lad, and all the people hate me; for I am slow of speech; wherefore am I thy servant?
32 And the Lord said unto Enoch: Go forth and do as I have commanded thee, and no man shall pierce thee. Open thy mouth, and it shall be filled, and I will give thee utterance, for all flesh is in my hands, and I will do as seemeth me good.
33 Say unto this people: Choose ye this day, to serve the Lord God who made you.
34 Behold my Spirit is upon you, wherefore all thy words will I justify; and the mountains shall flee before you, and the rivers shall turn from their course; and thou shalt abide in me, and I in you; therefore walk with me.

Elder David A. Bednar said:

“For all of us who feel unprepared and overwhelmed and unequal to a new calling or responsibility, the promise of the Lord to Enoch is equally applicable. The promise was true in Enoch’s day, and it is true today.”

(“In the Strength of the Lord,” Ensign or Liahona, Nov. 2004, 77.)