Growing cactus from seed can be a pain. The seeds are small, so they need very little cover, but they dry out really quick and they are worse with overwatering than lithops. They just dissolve.
I have had good results with the small dome/tray from elho. Overpriced but durable. I use a very fast draining cactus soil and amend it with a bit of sand on the top just barely covering the seeds.I keep the bottom of the tray wet but not soaked, and the dome keeps the moisture up. They grow like zits, and once they are the size of a BB they can get fussy.
I have several specimen plants and seed of L. williamsii, but "I strictly use them as part of my religious practices and prayer ceremonies" as that's the only legal way to obtain the specimen. The more pink/purple the flower, the stronger the plant. Or so goes the gossip. There are a lot of similar species that are sold as peyote but are not. One of those is the genus Matucana. True peyote is a spineless cactus.
Bubba you can find Bolivian's that you don't have to grow from seed. This is one I planted for my father's 65th birthday. It has grown about two inches in two years, but it's getting nice and girthy. I was planning on using the smaller limp one but they didn't want to be separated. This one is monstrose, but they aren't a specialty species and I don't know that anyone really cares about possession unless you are hunting on a reservation or something more absurd. One of the small ball cactus is bigger than the other. For accuracy's sake.
She's definitely invited:
Last one:
