Hebrews 2

Paul, having taught the Jews of the divine nature of Jesus Christ, teaches the truthful doctrine -

"Wherefore in all things it behoved him to be made like unto his brethren, that he might be a merciful and faithful high priest in things pertaining to God, to make reconciliation for the sins of the people.
18 For in that he himself hath suffered being tempted, he is able to succour them that are tempted." (New Testament | Hebrews 2:17 - 18)

One of His purposes in mortality was to experience life as His brethren and thus be tempted in all things, so that He know how to succor others. Alma provided even more incite teaching the people in Gideon that -

"...he shall go forth, suffering pains and afflictions and temptations of every kind; and this that the word might be fulfilled which saith he will take upon him the pains and the sicknesses of his people.
12 And he will take upon him death, that he may loose the bands of death which bind his people; and he will take upon him their infirmities, that his bowels may be filled with mercy, according to the flesh, that he may know according to the flesh how to succor his people according to their infirmities." (Book of Mormon | Alma 7:11 - 12)

The Savior experience more than just temptation, but took upon all the pains and sickness of His people. This would suggest that because of that, He already knows "how to succor his people according to their infirmities". Succor literally means "to rush to the aid of." There is nothing that we experience that He does not understand.