Michael Harner's book started it off, The Way of The Shaman. shortly after i met my own teacher Grey Owl.
i remember once we were paddling a canoe; going deep, getting darker. i started to panic and woke myself to my regular reality.
the vision quest in the mountains is what i remember most. collecting items in my power pouch that later disappeared, or perhaps were never there
4 blue jays circled my head 4 times.
that's all i remember; that and driving down the mountain while the sun was setting.