Ofcourse you cannot be prepared even if reading about it for 3 years, as you would know. But after trying 5-meo-DMT which was basically one big deluded panic attack then blacking out for me, I thought DMT would be like this, but more colourful.. how wrong I was.
Sure, DMT raises the hell out of your heart rate, but it is nowhere near as prone to anxiety as other psychedelics for me, or even weed. I find if an anxious thought or feeling does enter your mind, it is quickly replaced by the complete opposite, then when that arrives, it's already being taken over by something else. Just let yourself go.
Theres two types of DMT trips for me. Eyes open or eyes closed while coming up on it (the 15 whole seconds or so, lol). Eyes closed will surely put you into a different realm, a very dreamy state with sometimes interactable beings, or just amazing imagery and a very special out of this world feeling. However, what I also like doing is keeping my eyes open and let my eyes do REM in the dark, but with a light source in the distance (those yellow street lights do wonders).
The eye wobbling you will get on it is insane, and the thick patches of weird retina detatchment like visuals that flow through your vision. The lights in the distance (I would imagine city night lights to be amazing) wobble so hard and fast and all over the place they draw an actual scene in your minds eye, and I have actually had alien like figures walk out of a portal door a street light created for me and start rubbing my face, and I could physically see and feel them "heal me" as I was crossed over. Their hands pressing againsrt my face massaging it, very, very real. (while in reality it was probably just sweat on my face dripping down). They were friendly but had the most eerie(!) ever emotional attachmentment. I couldn't figure out of they were good, or evil.