Consider it rolling a dice and start LOW. SWIM is convinced Salvia may very well be less dependent on set and settings than other psychedelics, and may be more affected by personal bio/neuro-chemistry.
SWIMs experiences are hilarious. When he comes out he laughs loud, in a beastly matter. And laugh is very genuine. For him Salvia is a male presence, A TRICKSTER or JESTER of some sort, very light hearted. Where tryptamines must be approached in a very serious, almost zen-monk attitude, Salvia is "for teh lulz". First time he tried it he was sitting on a matress ripping the bong, approximately 4 hours after drinking ayahuasca analogue. As soon as he exhaled keeping the eyes open the edge of the matress folded(or rolled onto itself, like you would roll a sleeping bag) and for no more than 3 seconds he was utterly convinced that his matress was the only thing that belong to the real world, and if he reached beyond the matress he will go to another dimension. That realisation made him laugh very loud yelling "Salvia BRO !!"for minutes. This little prankster just came out played a huge joke on him. Did he really just convince SWIM this easily ? SWIM takes psychedelics very seriously and was surprised how light and genuinely funny this felt. VERY MUCH UNLIKE any psychedelic he took. SWIM notes that every consequent trip with salvia, done in different psysical and mental settings give continuation of the same story. The same presence is felt, but it goes on like plot-based television series.
SWIMs friend feels nothing from it, other gets rather fucked up experiences. Point being is go ahead do try it, find your "perfect" amount, but dont let that deter you from further experimentation with different compounds if experience turns out to be unpleasant.