AlexOliver wrote almost everything I would reply to this. I would like to add that there is a lot of knowledge theses days about building with adobe, cob, wood and others DIY techniques. Also regarding to build your own non-smoking wood stove and wood heater, there are a lot of techniques using simple readily available materials.
That said, I'm already on the countryside and planning to do just that. This year I plan to stop paying rent by buying some land. I'm also thinking about buying a used trailer for a good price, so I can sell it later at higher price. I would live in that trailer comfortably and have time to build and learn to build. After that, just sell the trailer for the same price or more. That's the quickest path for me that I can think of. I won't need to buy gas to cook as I will have plenty of dead wood from forest around. I will have some land where I will grow at least some of our food. Raise some chickens for eggs and meat. Maybe hunt in the woods once a year (we eat very few meat).
If I grow a part of my food from soil, I will probably stop needing fridge. Today we already use a very small one, probably could go without it already. We wash clothes by hand. I will build a solar heater for water and probably also use wood stove for building a water heating system. We will need almost no electricity: only illumination, computer, kindle and cell phones recharging. That's easy to get either by solar or other means. We could also use normal grid electricity that's is available in most places here.
You also don't need to use composting toilet. I think it would be hard to convince my wife to adopt it. But it's not that hard to build your own septic system. Ok, it IS hard in the sense that you will work a lot your muscles digging. It will take time. But it don't need to be expensive, It may be almost free. You will need to empty the system maybe once each 5 years or more. Remember that old manure is not the same thing that is flushed away from your toilet. If it is mature, it will have good smell. The old manure may be put below some fast growing trees. Later you may cut and bury the trees to make humus to your vegetables. Probably the first time you need to empty the system you will already be "retired" and have plenty of time for that. If you don't want to do that work yourself, in rural places you find people willing to do it for you for a price.
I don't see how any of this would be called sacrifice. Breathing pure air, eating organic tasteful food, having almost everything we need at hand... After ERE, I don't pretend to consume much from stores, but sell products to stores instead.