Think and Feel as a Missionary
"The challenge to become applies precisely and perfectly to missionary preparation. . . . You can increase in your desire to serve God (see D&C 4:3), and you can begin to think as missionaries think, to read what missionaries read, to pray as missionaries pray, and to feel what missionaries feel. You can avoid the worldly influences that cause the Holy Ghost to withdraw, and you can grow in confidence in recognizing and responding to spiritual promptings. . . . You can gradually become the missionary you hope to be and the missionary the Savior expects. . . .
"[Then you are] well on [your] way to becoming a missionary, [and] the basic adjustment to the rigors of missionary work and lifestyle will not be overwhelming, burdensome, or constraining. Thus, a key element of raising the bar includes working to become a missionary before going on a mission."
Ref. (David A. Bednar, "Becoming a Missionary," Ensign, Nov. 2005, 45-46)