The easiest tarot reading is the skeptical person who has never had it done before. The archetypes represented by the tarot deck freak them out in a big way; they didn't realize they had consented to Jungian psychoanalysis as conducted by a hippie herbalist.
"Who's the Emperor?" I asked one such skeptic. "Your father?"
"You're supposed to tell me that!" he barked, condescendingly.
"Okay, your father."
And let's not forget: Occam's razor works well for tarot, too.