Wiring: When you disassemble the horn button you can slip the contact plate off and that frees all the removable horn stuff, but leaves you with the horn wire sticking up.
There is a splice at the bottom of the column under the truck (sticking out the bottom of the steering box), unhook this splice and carefully pull the long horn wire out through the interior - you might be able to salvage the wire, and I had to wait forever for stock on this part from any vendor, nobody had em.

Soak the splined area of the wheel to shaft in PB Blaster or such penetrant, let it sit for a while, respray as often as reasonable - let the penetrant do its magic.

Carefully drill 2 holes directly across from each other in a straight line with the center hole and then thread them with 1/4 x fine and use a steering wheel puller (3 bolts and a piece of flat steel) - you can make it yourself if you have some flat steel... less likely to strip a 1/4 fine than a 1/4 x 20 since you only have a few threads to hang onto em by.

Replacement wheels most all come with the 2 threaded holes now.