I would think a first time DMT experience would scare most folk away from the psychedelic experience ( A breakthrough dose 30mg)... I think with most of us, there is always that space in time, between wanting to take a dose of any psychedelic. The anxiety just before taking it, the come up and other factors... But In the end, the trip is usually always wonderful...
Anyone's first time; It is important, that the attitude of people that may be around you are positive when you take your first dose, your set and setting... state of mind... This will effect how your experience turns out....
Because everyone is different, in how they think, your religious backgrounds, happy of depressed etc...... is why you never know how things turn out your first time...
My first time was by myself with 300 ug LSD. I was fortunate enough it was in a very positive environment... I did not now what to expect except for what the schools were teaching at the time, "how bad it was" (NOT)... it did leave me in awe... Led me down a wonderful path...