Wiper arm mounting

Hi All,

Pretty non mechanical guy here, so please bear with me. Here's my issue: Driver side wiper arm was no longer being rotated by wiper mounting. took off wiper arm and found wiper arm stripped. The mounting pin that moves the arm is not completely stripped but appears headed that way. Wiper motor still rotates the pin so I think that's ok.

How would I fix? And would it be easy enough for someone like me to do it?

Obviously need new wiper arm which I'm sure I can install. If I try and fix the mounting pin how would I do that?

Thanks in advance!
-Frank