The "secret" of the Kahunas is that they knew about the subconscious - which they called the "low self" - and the role it plays in all feats of power. A "secret" they knew hundreds of years before psychology even guessed at the existence of the subconscious. A "secret" they kept hidden so that they might use this knowledge for "good" and in some cases "evil". A "secret" many of the Kahunas of today - as well as most "healers", even those that work with the subconscious - do not fully comprehend.

-- THE KAHUNAS OF OLD HAWAII KNEW THE SECRET TO UNLOCKING THE POWERS OF YOUR BODY, MIND, & SPIRIT

You're spot on about the role of rituals and the importance of believing in what you're performing, but IMO it's better to stick to one ritual at a time until you succeed or fail (and maybe run out of faith in that ritual and then try to improve it or chose another one), I don't know, what if a ritual interferes with the "settings" of another one? Or like some medications that may cause some risk when taken together or mixed with certain foods or drinks.