In the last decade, two million Americans have attempted to leave behind civilization in favor of life off-the-grid - but most have failed. For the hundreds of families who decide to become homesteaders, the learning curve is a steep one. Now comes new series "Homestead Rescue," in which struggling homesteaders across the country are turning to expert homesteader Marty Raney - along with his daughter Misty Raney, a farmer, and son Matt Raney, a hunter and fisherman - to…