It depends a lot on what you define as self-sufficiency, and how much you're willing to sacrifie. Hugh F-W has said in the past he would never go self-sufficient because he likes drinking burgundy too much.
Where do you draw the line? Do you have to grow all animal feed, for instance? Because if you buy it in you are technically not self-sufficient.
If your DH can go part time and you save enough to live how you want to then go for it. Work should always be built around the life you want to live, rather than the other way around.
We heated our house this winter pretty much only with wood we collected. Still on gas for hot water because we don't have the money or space at the moment to switch to anything else. Rearing chickens and pigs for meat are my next plans. We're not self-sufficient in veg by any stretch, but we will get closer over the next few years.
Spend time learning about wild food too, if you haven't already. Wild garlic, for example, grows in abundance during the period of spring when there is not a lot of food growing in the garden.
The freezer is your friend. Get a big one. But learn other methods of preserving too - drying, salting, smoking etc., as you'll have to generate much less electricity that way 
John Seymour books are worth reading if you haven't already, although I find him a bit idealistic sometimes.
My personal view is that complete self-sufficiency is unrealistic for most people. Trading products and services is a good thing to do, and will help.
Create what you can, swap what you can and what you do buy, buy carefully and conscientiously. By saving money on food, fuel etc. you might find you can spend more money on better, more ethical products elsewhere.
Have fun, and try not to take it too seriously.