I would start the lesson by asking the class what they think is the difference between experiencing the Holy Ghost and receiving the Gift of the Holy Ghost. How are these related?
With the class you could consider the following passages from the manual:
“A person may be temporarily guided by the Holy Ghost without receiving the gift of the Holy Ghost (see D&C 130:23). However, this guidance will not be continuous unless the person is baptized and receives the laying on of hands for the gift of the Holy Ghost.”
“However, there is no guarantee that the person will receive inspiration and guidance from the Holy Ghost just because the elders have laid their hands on his or her head. Each person must “receive the Holy Ghost.” This means that the Holy Ghost will come to us only when we are faithful and desire help from this heavenly messenger.