clustering - Determining centroid of clusters of points in QGIS?

I've basically got the same issue as Identifying cluster centroids using ArcGIS Desktop?, but can't find a way to transplant the ArcGIS solution to QGIS.

I have household-level geo data for 10 villages spread out across the country. I need to find the central point of these household clusters, so that I can create a 10km buffer around that central point.

I am new to QGIS.