Hi Lizzy,
I have the same problem,
I was climbing for many years wind turbines and now reaching the 60 years of age all my joints are more or less worn out.
A problem in Thailand is that human labor is pretty hard to find. The mentality is more the way : This month I work, getting paid and next month I have cash in my pocket and disappear without further notice.
The month after the money is spent and I'll return claiming my job back (For another month) or even within the month of work they come and go as they please.
So I started to find out, what animal is suitable for doing a specific task
Pigs are the tractors incl. driver
Cattle is cutting the longer grass
Geese are cutting the shorter grass
Goats are good for weeding
Ducks do good job against slugs and snails
Turkeys are going with pleasure for bigger pests
Guinea Fowls take care of hidden pests, snakes and they are brilliant finding ticks protecting your dogs and cats (But they are LOUD)
Capybaras like rough grasses
Chicken will close the trenches that the pigs left by scratching
Dogs as puppies integrated will make even Chicken as their family and protect them from predators and thieves.
and the story goes on and on.
They will not ask for wages, they will not complain but will be happy to roam free.
So you have only a few tasks to maintain the pastures, re seeding etc. which needs way less manpower..
You will be the one who does mainly the Administration works like pasture planning, lifestock exchange etc etc..
80 Acres are sure great to make pasture paddocks and if you make a smart sacrificial center (Pig Pit e.g.) your job is to monitor the pasture, open one gate for the coming days and close the one connected to the pasture they use till it is cleared.
Sure not everything what is shining will be gold and you might need to improve things as there is no one fits all solution...
Picture 1:
I had to cut out of my drawings the sacrificial area as it needs to be designed matching your pasture paddocks and your needs.
Picture 2:
With a good planning (Manure and
Urine management like composting pits) you even could make a
fence around this sacrificial area and on ground level you have the pig area incl. gates
Above the
fence you make a highway with gates that work also as ramps.
Put the building for the goats above the pig area and hit two flies with one clap.
Goats love elevated housings as they are brilliant climbers.
This way you could even separate the pigs on one pasture and send the goats on another..
I even thought to integrate the chicken coop there but I will let them "work" as they like speaking free roaming.
This is a very basic explanation of my tasks but I am planning now since 7 years the "how and why" and made improvements as they popped up in my mind.
But may be it helps...