I'm going to sidetrack a bit and rehash what Zaitchik refers to as an "ideal" dose of psilocybin:
Even the dose employed is the result of trial and error: The Johns Hopkins team has identified the golden mean — between 20 and 30 milligrams, roughly equal to a good fistful of strong ‘shrooms — to maximize peak experience while minimizing transitory anxiety.
That's a dose somewhere between "strong" and "heroic," maybe 4-6 grams of dried mushrooms. I would advise against grabbing a literal fistful. Leo Zeff, the "Secret Chief" who administered probably a few thousand trips, recommended 3 grams, but doubled that for alcoholics. Some would comment that even 3 grams might be a lot for a first timer. On the one hand, I like the idea of a relatively high dose to fully break through - a lower dose may not do that. A 2.3 gram dose got me to a mystical experience, but it took 6.2 grams for me to have a decisive experience of oneness, at least the first time. But on the other hand, if you have an opportunity to work up to that dose, that may lead to some better outcomes overall.
After a lot of successful trips and meditation, 0.25 grams is all I personally need, although I don't see much in the way of visuals at that dose.