It is not correct to assume we receive the baptism of fire and the Holy Ghost when hands are laid on our heads. Elder Bednar confirmed this here. It IS safe to assume, however, that if we have a desire to accept the Gospel and act upon its teachings, then we have some portion of the Spirit. Paul confirmed this here.
So how do we know if we have had this experience or not?
As I stated in an earlier post, the baptism of fire and the Holy Ghost is felt. It is tangible. Just as you felt the water during your water baptism, you will likewise feel the fire during your fire baptism. This does not occur slowly over time. It is an event. You will know when it happens.
Below is Lorenzo Snows’ experience. Pay attention to the highlighted portions:
I was baptized by Elder John Boynton, then one of the Twelve Apostles, June, 1836, in Kirtland, Ohio. Previous to accepting the ordinance of baptism, in my investigations of the principles taught by the Latter-day Saints, which I proved, by comparison, to be the same as those mentioned in the New Testament taught by Christ and His Apostles, I was thoroughly convinced that obedience to those principles would impart miraculous powers, manifestations and revelations. With sanguine expectation of this result, I received baptism and the ordinance of laying on of hands by one who professed to have divine authority; and, having thus yielded obedience to these ordinances, I was in constant expectation of the fulfillment of the promise of the reception of the Holy Ghost.
The manifestation did not immediately follow my baptism, as I had expected, but, although the time was deferred, when I did receive it, its realization was more perfect, tangible and miraculous than even my strongest hopes had led me to anticipate.
Some two or three weeks after I was baptized, one day while engaged in my studies, I began to reflect upon the fact that I had not obtained a knowledge of the truth of the work—that I had not realized the fulfillment of the promise, “he that doeth my will shall know of the doctrine,” and I began to feel very uneasy. I laid aside my books, left the house, and wandered around through the fields under the oppressive influence of a gloomy, disconsolate spirit, while an indescribable cloud of darkness seemed to envelop me. I had been accustomed, at the close of the day, to retire for secret prayer, to a grove a short distance from my lodgings, but at this time I felt no inclination to do so. The spirit of prayer had departed and the heavens seemed like brass over my head. At length, realizing that the usual time had come for secret prayer, I concluded I would not forego my evening service, and, as a matter of formality, knelt as I was in the habit of doing, and in my accustomed retired place, but not feeling as I was wont to feel.
I had no sooner opened my lips in an effort to pray, than I heard a sound, just above my head, like the rustling of silken robes, and immediately the Spirit of God descended upon me, completely enveloping my whole person, filling me, from the crown of my head to the soles of my feet, and O, the joy and happiness I felt! No language can describe the almost instantaneous transition from a dense cloud of mental and spiritual darkness into a refulgence of light and knowledge, as it was at that time imparted to my understanding. I then received a perfect knowledge that God lives, that Jesus Christ is the Son of God, and of the restoration of the holy Priesthood, and the fulness of the Gospel. It was a complete baptism—a tangible immersion in the heavenly principle or element, the Holy Ghost; and even more real and physical in its effects upon every part of my system than the immersion by water; dispelling forever, so long as reason and memory last, all possibility of doubt or fear in relation to the fact handed down to us historically, that the “Babe of Bethlehem” is truly the Son of God; also the fact that He is now being revealed to the children of men, and communicating knowledge, the same as in the Apostolic times. I was perfectly satisfied, as well I might be, for my expectations were more than realized, I think I may safely say in an infinite degree.
I cannot tell how long I remained in the full flow of the blissful enjoyment and divine enlightenment, but it was several minutes before the celestial element which filled and surrounded me began gradually to withdraw. On arising from my kneeling posture, with my heart swelling with gratitude to God, beyond the power of expression, I felt—I knew that He had conferred on me what only an omnipotent being can confer—that which is of greater value than all the wealth and honors worlds can bestow. That night, as I retired to rest, the same wonderful manifestations were repeated, and continued to be for several successive nights. The sweet remembrance of those glorious experiences, from that time to the present, bring them fresh before me, imparting an inspiring influence which pervades my whole being, and I trust will to the close of my earthly existence.” (Eliza R. Snow, Biography and Family Record of Lorenzo Snow, p.8-9)
I testify this blessed event is true. Do not be overcome if you realize you have not experienced this. Let this consume your thoughts and prayers and seek it unceasingly. As the Lord has said:
“And blessed are all they who do hunger and thirst after righteousness, for they shall be filled with the Holy Ghost.” – 3 Nephi 12: 6
“And ye shall offer for a sacrifice unto me a broken heart and a contrite spirit. And whoso cometh unto me with a broken heart and a contrite spirit, him will I baptize with fire and with the Holy Ghost. . . ” – 3 Nephi 9: 20