In my various callings, I have told the full-time missionaries in my wards and stakes for the past 15 years to stop telling people exactly how they will receive an answer to a prayer or a testimony. I also have told everyone who will listen to stop telling people they can "know" whatever they want to know. Those two claims simply don't match our scriptures.
First, just like teachers tend to teach with their own learning modality, members and missionaries tend to think everyone will feel and experience the same way they do. To complicate it further, we tend to think if one person was told they will feel the Spirit in a certain way (e.g., Oliver Cowdery's burning in the bosom and stupor of thought), then everyone should be able to feel it in the same way. We need to recognize that the "fruits of the Spirit" are wide and varied, and any one of them can signal an answer to prayer or a spiritual impression. What makes it "real" to the askers is their own recognition of it, which is the tricky part.
Second, "To some it is given by the Holy Ghost to know that Jesus Christ is the Son of God, and that he was crucified for the sins of the world. To others it is given to believe on their words, that they also might have eternal life if they continue faithful." (D&C 46:13-14)
We really need to acknowledge this belief and not hold investigators to a standard to which God does not hold us even as baptized members of the Church.