We learn to teach "by study and also by faith" I

D&C 11: 21-22/19: 38 "seek to obtain my word... study my word" "you should obtain treasures of earth and corruptibleness to the extent thereof"
D&C 42: 14/100: 5-8 "and if you receive not the spirit ye shall not teach" "speak the words that I shall put into your hearts... in the spirit of meekness, in all things"
D&C 88: 118 "seek ye out of the best books words of wisdom; seek learning, even by study and also by faith"

Obtaining the word of God prerequisites obedience and prayer so all three components prepare missionaries to receive inspiration. Obedience shapes our spirituality. Personal revelation is the way Heavenly Father communicates to us through the Holy Ghost; therefore, we are to pray God which is the way we communicate to Him through the Holy Ghost. Consequently, we need to learn to recognize the promptings of the Holy Ghost, which sometimes may take time to come to us. In order for the Holy Ghost to testify to our minds and our hearts as we study the scriptures, we need to consume the words of God, we need to ponder upon them, and we need to ask God to clarify our understanding.
Pdt Benson quotes: "to study by faith is to seek understanding and the Spirit of the Lord through the prayer of faith." It is only through studying by faith that we are granted the power to convince hearers and learners. We are planting the seed or the doctrine of the gospel, and the scriptures suppport it.
The scriputes are integral to our study because the Lord promises to succeed righteously, to have power over temptation and deception, to be guided daily, to be healed from wounds and more to those who partake of His word. Also, L. Tom Perry quotes: "Our minds were sharpened as we followed the daily practice of individual and companion study. The practice brought us closer together as companions and increased our understanding of hte doctrines of the kingdom". The spirit power will assist us as we do a lesson plan also in companionships. Pdt Howard recommends that we set a duration of time to study the scriptures instead of a set of quantity of verses or chapters. A written preparation to teach the restored gospel helps organize our ideas, thoughts.