That's the big question. Some ops are so simple (burning vast forests etc) that it would take no training or logistics, just desire. For that matter, hijacking a gasoline tanker and driving it into the lobby of a major corporate HQ might not be too hard either. You just need a suicidal jihad truck driver with a pistol.
I don't think we have the political will to do whats necessary. We won't even stop the flood over the borders.