My Intermatic T104P3's clock stopped working. All systems go when turned on manually. Can a guy who is all thumbs fix this?

Yes you can fix it if you are handy with a screwdriver, buy a new intermatice timeclock insert. Make sure to get one that is identical. Then transfer each wire from their location to the same location on the new timeclock. Pull out the old one and put the new one in it's place and you are good to go. Make sure to turn the power off first