>>790584Dude it's fun! You can do it yourself, it's not hard.
You can either buy a handle online or carve one yourself as a custom fit.
The actual handling is just a knife to carve the handle top to fit the eye, then a thin saw to cut out a slit that a wood wedge can be driven into to secure it hard.
You have lots of options to improve the axe, like linseed oil to give extra security in the head wedge but there's no real need to buy any of them if you do a good job getting a good fit with the rehandling.