I surfed Puerto Escondido for 3 months when it was small, so around under double overhead and it was a difficult wave.
1. The wave is basiclaly a close out, there are so few open waves.
2. The wave is very fast, faster than most waves you will surf.
3. You have to be careful because it is very shallow. You need to commit when you decide to takeoff.
4. You need to surf early, as soon as it gets light as the wind gets up.
Having said all this, the wave is amazing, you will have some of your best rides ever.