This seems like a wonderful checklist.
I have to go through a lot more preparation than most people I've spoken with in order to use psychedelics productively and to have a fulfilling and positive experience. A combination of being a cripplingly overanxious person and going through a great deal of trauma has meant that my self-care regimen begins often days before I can explore an altered state under the right circumstances.
Have extracted my DMT quite a while ago, and yet my friend (and tripsitter) and I are both waiting patiently for me to have the right conditions and cultivate the right mindset before we make the attempt.
I occasionally use LSD or 4-Ac0-DMT/Mushrooms in what most would regard as VERY powerful doses, and have found great value in advice like yours and am so grateful that people discuss these aspects of tripping as well, both for harm reduction, and for setting oneself up for the best chances to have a positive experience.
I would add my own rituals and tips if you'd find it fun to compare checklists (I refer to it as my 'ceremony'
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1.) Take special care to eat well, sleep well, exercise and hydrate for days leading up to the trip. Stretching and feeling good about my body is critical.
2.) I used to listen to highly cerebral music beforehand; a symphony, jazz or big band orchestral stuff, Pink Floyd or Hendrix albums, etc. Watch heavy epic films like 2001, Gandhi, a Hitchcock film, or some Kubrick masterpiece, to get me in the "deeper" headspace. Not anymore.
I've come to believe that this is kind of artificially 'forcing' it, and creating some stressful expectation of what the trip is supposed to be like, instead of listening and watching what happens. Now, I do my best to simply feel my best beforehand. I watch the silliest and funniest films I can. I put on the Three Stooges or Monty Python, some beloved standup comedian or whatever else gets me laughing and releasing tension and stress as much as possible to mitigate the 'pre-flight' jitters. Get those good hormones flowing!
3.) Hydrate even more! Thirst is one of those things that connects me back to my body, and will not let me experience ego-death or disassociation from the material world if I feel the needs of my body have not been addressed.
4.) Similar to thirst, I do not want to feel hunger during my trips, but also want as little as possible in my belly as I am prone to stomach discomfort using almost any drug. 3-4 hours of fasting is my sweet spot.
5.) Clean your house. A tidy room and home speaks back to me that all things have been taken care of, and that there is nothing else I am neglecting or needs attention. I am allowed to have this time for myself to explore.
6.) All needs have been taken care of. There is nothing I have to do, nowhere to be. I don't want to be problem solving or trying to do anything while I am 'under' or in the hours after the drugs wear off. Good, nourishing foods have been prepared for when I am ready. Drinks are at my bedside, as well as my glasses, asthma inhaler, journal and pens, towels (I lose body temperature regulation very often on psychedelics), stomach medicine, a pitcher of lemon and cucumber water in ice, headache tablets, tissues, ginger, a book, remotes and a film ready to go afterwards, and just any little comfort I might want, especially if I don't want to get out of bed after. I make my home like a perfect little report or spa, and my bed like an upscale hospital room. Anti anxiety medication I never take, but which I feel good knowing is nearby f I needed to relax or to sleep right away if I am in distress. Even good smelling incense or candles burning somewhere safely in the sink.
7.) Have a shower, brush teeth, get into pyjamas. Just feeling clean is helpful and contributes to my self-care ritual.
That's about it.
I must say, I usually abort or pull the plug on a planned experience twice for every one I go through with. If everything is not just right, or my mind is not telling me I am perfectly ok to try something if I'd like, I simply won't go. I would prefer no experience to a harmful one.