"Nah. It's so easy even someone from the Stone Age can do it."
"Is the purification ritual complicated?"
Define "complicated". One of the rituals (so I've read) was for the ruler/priest to cut his penis with a knife and bleed on the ground which supposedly sanctified the ground with new life. Think Juan will be up for that? Complicated, no. Incredibly ignorant, well, I hate to go against the PC crowd, but YES!
Additionally, the Mayan calendar ends in 2012 (I can't remember which month). I can't say I put much stock in it. I always figured they got tired after figuring it out manually, and just said, "Oh, screw it! We won't be here anyway."