IMO i think taking half is just like a body high, i would stick with one or maybe even two, two for me is what i need to induce visuals.
During an LSD sometimes if you let something get at you, it will only take over and make you more scared of it. I have had terrifying experiences, but its something that you have to get past, i use to think the same way, if i take it again, will the same thing happen again? no it wont not unless your thinking about.
Two important thing when using any substance like this, Set and Setting, Stay positive always, going into the trip, and leaving it, make sure you are in a good setting with a close friend, not preferred with a lot of people.
Psychedelics is a great cleanser, it cleans out the body, gives you a new vision of life, your new perception you are seeing of the world is the world, your barriers are slowly being dissolved away.
Good luck on your next trip i believe it will be great and you will be overwhelmed with positive energy and love, Yes this will all happen, safe journeys.
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"You are an explorer, and you represent our species, and the greatest good you can do is to bring back a new idea, because our world is endangered by the absence of good ideas. Our world is in crisis because of the absence of consciousness."
— Terence McKenna
"They Say It helps when you close yours eyes cowboy"