Yes the grounding of the horn is not an uncommon problem. The parts needed for turn signals and horn in the column are not robust. Take pictures of the sequence of bits and pieces coming out of the column in case you get stuck. As suggested, not a hard project.
Lugnutz (member here) has a real nice write up on the column rebuild. Might be a good resource for you.
https://lugnutz65chevystepside.weebly.com/
