I got elbow and shoulder problems that came with old age. I have a small 5 pound sledge as well as big ones. I tried a 2 pound sledge and it works pretty good for a lot of the jobs I was using the 5 pound sledge for. Try one!
…and if you got lots of T-posts to drive. Try a power T-post driver for them.
the t post driver is a game changer. its a b***h to pound them in my rocky clay with a sledge. i wind up buggering up the top so bad it isnt reuseable.
Tpost driver is essential. For high quality hand tools I recommend Stoneworking Hammers | T&H Masonry Tools and Accessories
I removed around 100 t-posts earlier this year.
In case anyone ever has to do it…this works for me.
Good old stout pipe wrench and a lightweight easy to move floor jack… pops them right out.
YMMV with equipment or other various means or tools.
I use a manual t-post driver. something similar to this.
To take them out I can usually just lean on them and rock them back and forth enough times to pull them out by hand.
I’ve used a high lift jack to take out several stubborn old fence posts. I’m assuming you could use it for a t post too if need be.
I have one of these and after learning how to use it, i highly recommend it. My daughter in law borrowed it and she had no problems removing t-posts with it. Now I just wrap a chain around the t-post and use the hook on the tractor bucket. But before I got a tractor with loader i used it a lot.
A friend taught me to use a T post driver as a T post puller. It’s a pretty neat trick that you can use the same tool for both operations. You place the closed end on the ground and brace the open end under a lug to use the driver like a fulcrum. With the driver between you and the T post, pull back hard on the post until it pops up a bit and then reset the open end of the driver beneath a lower lug and keep at it until it can be lifted by hand.
For those of us that use sledge hammers one handed, a 2 lb sledge is a mallet.
I can do about 10 or so by hand before it turns into something that looks like the worlds strongest man competition on the 10th one that just wont pop out. 
They make this clip and sell it at TSC and various other places
That is about all that you would need if you have one of the old bumper jacks from the 70s that would lift grandpas 3 ton car with a big block.
But thats me… im all about repurposing things that work…and i dont pull t-posts for a living its something i have to do…due to my poor planning or changing my mind on something.
I happen to have several floor jacks and several old pipe wrenches so thats what works for me.
My Dad had several of those bumper jacks and i remember using them as a kid. There was some kind of switch that if you touched it… it was like some kind of instrument of destruction. I think its probably one of the most dangerous tools that one can have for a car.
I got a dedicated T-post puller. Never knew they made that attachment so you can use a jack to pull posts with.
You rich farmers…get this! I will get one when I hit the lotto and buy some acreage, mini tractor and a hundred more trees to plant with 100 deer cages for said trees.
New T Post Driver 98-E for Sale at Rohrer Manufacturing
I put in +/- 240 T posts over the years by hand. I used to use the hand driver.
Last 2 years it is all sledge hammer. Sold the manual driver. #5 sledge works fine for me. You use a 2 hand manual driver…wear earplugs!
For inspiration I provide here a compelling snapshot of my home-made post driver:
It consists of a two-foot length of 2" galvanized pipe for heft. Threads on one end must be in good condition to accept a cast cap as a hammer. To use, slip the open end over a post. Set the post upright, lift the driver, and hammer the post into the ground, using the pipe as a guide.
I live on a sand dune and could probably drive a post with a claw hammer, but I consider this safer. From early adolescence I bear the scars of mashing my left index finger between the top of a post and the handle of a 10-lb sledgehammer.
link for those that are interested
https://www.tractorsupply.com/tsc/product/agknx-t-post-puller-plate
I recently realized I need to make something like this for hammering in my fiberglass Ecostakes (7 ft. x 3/8 in. Dia). Hitting them with a hammer over my head is less than ideal.
Also I need to wrap the top of the fiberglass poles in tape or something as I found striking it makes it fray.
