OK... it cost me years to learn and untold $$ ... and all my experience is now brought to you via the joy of TBN....
High tensile wire is superb... but you MUST learn how to handle it... there are special knots (trust me) that you need to learn about.. for splicing wire and tying off at a post. Also for how to cut it without a wire cutter.
I use 4 strands, two hot, two ground.
I use metal t posts about 15 feet apart, plastic insulators that wrap around to the back side of the post are best.
donut cermaic insulators
insultube is your friend, learn about its use to
high tensile wire insulated for ground burial I put inside a 1/2 or 3/4 inch black plastic pipe and pull under gates... fantastic plan.
knife switches at every fence corner allow you to isolate/identify bad pieces of fence
be sure and ground VERY WELL your fence charger
critical to have a lightening arrester installed close to your fence charger
power surge filter on your input plug for the charger
small bolt cutter for cuttig hi tensile wire... regular wirecutters won't work well at all
Here are some of the old threads I've saved that may be of interest to you.
ditch digging
Secrets of pulling poly pipe without a ditch.
more secrets
and even more
OK.. the real secret is that you should use the TBN search function and search on: subsoiler pipe pull
if you don't get at least 10 threads, something is wrong. This works, you gotta try it, both for laying undergroundpipe and underground insulated wire.
Now, about putting T posts in the ground... use your FEL, have a buddy hold the T post, lower flat bottom of FEL

, buddy retreats to safe distance (they can rainbow/break if you hit a rock just wrong), gently lower FEL until post is properly in ground.

around the post of proper length so that sheath hits ground when post is properly driven.
To pull T post, wrap chain around post, hook to chain hook on FEL (you do have such a chain hook, don't you) and lift FEL.
Look this stuff up on the web, etc... if you can't find it, PM me.