Well... as you already noticed, intelligence doesnt have anything to do with the difficulty of being hypnotised... what really matters is how much one is willing to be hypnotised. Anyone who fights the hypnotizer is hard to be hypnotised, and anyone who cooperates is easy to be hypnotised.
And now that you had a very good experience, im pretty sure it will be even easier for you to reach again that blissfull depths of relaxation... and they are blissfull indeed...

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"Everything we do, everything we are, rests on our personal power. If we have enough of it, one word uttered to us might be sufficient to change the course of our lives. But if we don't have enough personal power, the most magnificent piece of wisdom can be revealed to us and that revelation won't make a damn bit of difference." Don Juan Matus - Tales of Power