Anyway you can get the stuff into you will work. You could literally eat 8-12in of cacti cuttings but after seeing their mass, about 1lb per foot for what i just got, I dont know if it would be possible to eat that and not puke it up. Also when you make the goo or tea you may see why people have a hard time keeping it down as well.
I just got my 12 cuttings last week and cant believe people actually try to ingest it as a plant... maybe its because psychedelics make me nauseous but cacti are big and hard to ingest i would imagine. The best way for someone with no training in A/B extraction, especially with live material as you have to work it into a puree and then boil it down etc it can be a lot of work, would be tea. At least with that you get the job done quicker, my little work up has been on going for days now.
Tea/snot is a good start I would imagine but you may want to wait for someone with more experience in gulping down huge amounts of raw cacti material, that is not myself!