Mescaline cacti - Preparation for the trip

[TMM]

SWIM has a substantial amount of dried Peruvian Torch cactus, and plans to take 30g at some point in the near future, perhaps with another person taking the same amount. SWIM has tried PT before, from a different supplier, at under half this dose. He came up over a period of about 3 hours and got minor (but still apparent) mental effects. There is little to say about this experience, except that SWIM felt a little drunk and music sounded a lot better when he was finally in the comfort of his own home (long, boring story). SWIM learned later that this dose was definitely too small, especially for someone like SWIM who has a generally high tolerance to most drugs and never experiences any visuals.

But enough about SWIM. Before SWIY embarks on a journey with SWIY's cactus-of-choice, what does SWIY do to prepare? SWIM has heard that it is preferable to do it in nature, but this isn't always an option. SWIM has seen a lot about mental preparation for mushroom trips, but not so much for mescaline, so he is curious about how mescaline aficionados like to prepare and set their trips. What mindset does SWIY try to enter the experience with, and what does SWIY usually hope to gain from it?

SWIM sends his regards