It is Surprisingly Easy
Anyone who can follow written instructions and who has basic skills can make a Native American Style Flute from agave and/or yucca stalks.
There are no expensive tools needed. There are no insider secrets needed. And there is no complicated math needed. I guess you need some fundamental skills with hand tools, but you do NOT have to be a skilled woodworker, cabinetmaker, furniture maker, handy man, or musician. Seriously, you can do it.