Even for those who might have the skills, the availability of the necessary tools for accomplishing things without power just isn't there. Without power (gasoline, diesel fuel, electricity, etc), everything will have to be done either by hand or animal power. this requires a whole different set of tools than we currently have available in mainstream society; the Amish have the tools. Unfortunatley, the Amish won't be available to teach the rest of us how to make those tools since they are pacifists and will likely be killed in short order to have their food and possessions stolen.