Some-one once told me - "don't try to eat the elephant in one go, easier if you eat it chunk by chunk". Thats the attitude my wife and I have to take, in exactlly the same position as yourself. Had to run 200 meters of post and stock fencing = 100 posts, just set myself a target of 15 posts at a time (sinking posts with hand held post rammer), and it will be done when it is done, finally got it done. It is hard, especially when you have a full time job as well, but we count ourselves lucky, because not everyone can experience the pleasures (and awful setbacks) of keeping livestock, and producing your own food.