Living in an Undead World

Some Zombie attacks (like the Class 1 or Class 2) are easy to overcome as long as there is some force, such as the government (or you!) to stop it by eliminating all Zombies. BUT - What if a Zombie attack goes undetected? Then we're doomed.
A Class 3, or the rare and dangerous Class 4, are very challenging to overcome. Is it possible? Maybe. Such a large amount of Zombies are most likely to be spread out already due to their loner natures, therefore, containment is impossible. What does a person do when the world is already overrun by Zombies? How is survival possible?
The answer is to recreate society. For thousands and thousands of years, humans have been creating society and adapting to the habitat that they occupy. Society is already created, so for a human of our intellect, we are many years ahead of the original homosapien. Take many people, find a remote, unoccupied place on earth (preferably a distant uninhabited island), and live there. Think of it as one of those survival movies and TV shows where the victim's plane crashed on an island, such as Gilligan's Island, Cast Away, and Lost. They seemed to turn out okay... except when Tom Hanks lost Wilson, but if you have human companions, you won't even need a Wilson.
When recreating society, a person has a lot to adapt to. Today, people are so cushioned by luxury items, it is hard to function without them. One must assemble a group, wean themselves off luxury items, find out where to go, acquire knowledge of this place, plan the safest route, have backup plans, remain concealed and isolated. You and your group are now, as far as you are concerned, the only humans left. It doesn't matter if there are any other humans, they are nonexistent in your eyes.