I always have a person with me, but I prefer they do their own thing rather than pay attention to me ( i do not like to be expected to interact while on salvia ). A nice meadow in the woods would be a good place to experiment, someplace secluded where nobody would ever show up and no phones ringing etc...

And be careful with that glass man! Salvia is a reason to break out that old acrylic graffix from junior high days!
Very sound advice