If you don't then you will not get acquainted with the character of the experience. I did it in a dark room with no sound. (With my friends there to administer the dose and keep me company) =) I would say it's inevitable that you will slip into a breakthrough sooner or later, and if that happens and you are unprepared for it I feel it would be less of an enjoyable experience to hit it head on not expecting it than to hit it head on intending it. ~ My 2 Cents...
I= SWIM = Not Me. The I AM I Does Not Exist, and is Referenced to SWIM Who Is Not A Friend I Never Met, Nor Hallucinated While Imagining The Is-ness of Suchness That Is SWIM Who Is Not Me, Myself, Nor I As The Expression Of Non Dual Aspect of Non-Dual Reality Subjectively Denied By Swim, or accompanying Me-Anti-ness'es. =) All Credit Goes To The ANTI-SWIM'ness of SWIM's cousin's room-mate's uncle's deceased cat's in-law's second removed nephew's aunt WHOM authored SWIM's 2000 Year Old Desert Scribblings from a drunk rabbit in the Serengeti desert found in an insane asylum under water, on Easter eggs, crucified by the on fire pagan music listening christian maniac from India running around believing he was Jesus repenting this bush he called the Acacia tree; So I Heard from a bum who claims to be SWIM, But I Forgot... And Again, "I" Refers To Someone Who Is Not Me.