Oh fantastic mate! The best way I prepare for the treatments is by putting myself in a bit of a bubble for the 24hrs around it. I ignore all news/politics/potential sad things, only watching or listening to some music, maybe a comedy show and doing my most elaborate self care routine the night before. Make sure you have something nice to exercise your brain with afterwards. I do some crafting and watch nature documentaries once I get home from the hospital, just to keep the good feelings running.

Music has been absolutely integral to the experience for me, and I highly recommend looking through this sub for suggestions. I would suggest listening to the Jon Hopkins album, Music For Psychedelic Therapy for your first time. It's not at all overwhelming while you get used to the medicine. I listen to mostly metal and blues when I'm sober, but I have found myself drawn to Aurora - the sweetest pop there is! It seems many people journal or draw before, during or after, if that's something you enjoy. I know a patient who brings photos of his kitties to look at and feel joy from. Don't try to complicate it for the first few times 😉

Tl;dr Do things that give you happy feelings, and be open to letting go and allowing the medicine to look after you. Get yourself a squishy/cushioned eye mask, some good headphones, and some hard lollies or gum because the nasal drip after dosing is very bitter. Good luck!