Data Governance... who, how, why?

The way I see our customers are working with this is most often in Data offices as sashakorniakUK​ is mentioning.

The main challenge is adoption when working with Data Governance, I always suggest to start small and slow, and scale with time. Have good change management material is key, do everyone know what a data product is? 

You need to build your data map in a way that it will supports different scenarios incl environment segregation, and then make sure that people are not able to edit eachothers assets in their collections.
Then its all about the unified catalog and how you structure the governance domains as well as identifying who should be responsible managing the catalog.