what im truly getting myself into
A very nice time, most likely!
Just be aware that mescaline is very unlike Aya in that it doesn't impose itself on you. Even when visuals and physical sensations are strong, it still has a gentleness to it, and the intensity goes down if you need it to (e.g. to go pee). Also, if you're looking for depth, it requires your collaboration by focusing on the experience. With your eyes closed and focusing, it can get quite deep. It just won't force any depth on you like Aya may do, at least not at that dose.
In my case, my mind feels slow and sometimes kind of empty. I can enjoy just being there, like a rock (or a cactus), without doing anything.
There's this paradoxical effect that, despite it being stimulating, one often doesn't feel like moving at all, particularly during the first half of the experience. The second half can be very adequate for hiking or doing some kind of physical activity, but again the stimulation doesn't force you do it.
Expect some possible nausea during the first couple of hours, but it's a nausea that's nothing compared to Aya nausea. Again, very gentle and benign, and will go away once the come-up is over.
Having a strong cup of coffee at the midpoint of the experience gives it a small boost in intensity.
Enjoy your experience! I have been getting into cactus for the last few months and I find it to be excellent.