24 acres is a pretty good sized area to fence, and it won't be cheap. However you can reduce your costs if you can use the existing trees as 'fence posts'. The divided pastures won't be perfectly square, but your horses won't care.
Take some time and look at those you have available, and use some colored marking tape to tag potential corner and line posts (trees). You can then see where you will have to supplement with some line posts.
Also, contact your local power company and ask them for old used telephone poles. They will be more than happy to give them to you - and will deliver them to you. You can chain saw these into 8-10' posts. You can use the smaller ones for line posts, and the larger diameters for corner poles when necessary.
I would also suggest not trying to get square pastures, but rather go for longer narrower sections to give the horses a run area where they can also get some exercise.
I have used high tensil wire quite successfully and without any injuries. Some will warn against using it, but it's very cost effective, and if horses are introduced to it properly, you should not have any problem. TSC has large coils of the wire and all necessary Hardeware. Get the property owner to buy the materials, and you can organize the labor.
When installing it, do it properly and use good eyebolts at the connection points, tension springs on every straight run, and double up on the crimps when making connections to the eyebolts or winches.
I also run 2 strands of wire on each side. I initially tried to use the high tension wire as a 'hot' wire as well, but that was futile as keeping it insulated and using it under high tension just didn't last. I ended up running electric rope for hot wires above and below the two high tension wires. This effectively gives you 4 strands making it easier to see.
Before introducing a new horse to a pasture, tie some plastic colored marking tape along the high tension wires every 10-15', alternating between the upper and lower wires. Between this and the 'hum' caused by the vibration of of the stretched high tension wire, will keep most horses attention to where the wires are.
Start with the easiest areas first, to make it useable, and keep expanding as you get time and help.
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