Well it’s not hard (I have Linux experience), but I’m worried about the time investment to maintain and secure it myself. I’d rather pay someone else to do that for me…
I’m surprised you don’t like OSM, in terms of the actual map it’s much better for me than GMaps. The only thing I still use GMaps for is to see reviews of restaurants etc.
No worries, if you also want to use it on your phone be sure to check out the OsmAnd or Organic Maps app.