In my younger days, I tried a lot of that. Trust me, after raising your own meat and vegetables for a couple of years, you will fall down on your knees and thank God for supermarkets. You can buy meat, eggs, and milk in the store much cheaper than you can buy the feed for the animals required to produce them. Let alone the fencing, pasture, vet bills, etc.
I'm on an electric generator for a couple of days while they work on our power lines, but I never forget that other people had to design and build that generator, and yet others had to extract the oil and refine it into gasoline for me so I can be "self-sufficient".
You are correct: it's very labor intensive. we live way
out in the boonies and we are not hooked up to any utility.
I installed a solar electric power system when I built our
house and it has been very satisfactory. (we do have a generator for back-up and to power the well pump).