Get 30 inch or something. 12" is literally treshold. If you want something that guarantees identity lose over 50 inch is required. But remember that unlike other psychedelics, this wizard may be for life...
Dry the entire cactus in front of the fan in very small pieces. Remove the skin carefully and STERILE! It might take a few weeks to dry all the material. Once you have done it repeately for enough material swallow the parts with juice as a breakfast, it might take hours or half a day to eat it all. And it might take 6 hours to 8 hours before EVERYTHING is absorpted. Don't ever PUKE! Relax, the cramps are abnormally and horribily long lasting. Go through it! Despite the sickness and drowsiness, too.
If possible, go to take a nap...
This is something which you do rarely, and you'll understand why, once you've done it properly.
If you thought you escaped from bondage through shrooms, acid or DMT... this is not a disortion or altered perception within this world. This world is not a mechanism in which you feel the duty to change it for 'the good' as with 'classical' psychedelics.
I closed this world, because a bold new world with unbounded freedom presents itselfs. Take your pencil and draw the impossible within your consciousness.
You won't need your legs to walk in this world. You'll fly over the ground with your upperbody, gravity is unknown. Dancing and moving is similar to having an orgasm. Feather light with a magical cape.
Lay down Dream, dream and dream, dive through every paper that torns, beyond the last sheet, the 2D painting opens itselfs and beyond the white light a new 3D world in where you can move, breath, stand and design the impossible. But you'll need the level 5 dose, which might be only possible with the highest potent cacti.
Sexuality is a creation of this world, you won't have to search further for anything or anyone. This world is merely an oxygen tool to keep your body and consciousness alive for the world of painted dreams.
The plant has changed me forever, I thought I was a man that needed another half. Untill the plant showed me that consciousness can paint itself rather than searching for another drawning as an addition to life. Everything can be teleported back into the now.