Printsy member Mariann Johansen-Ellis (mariannjohansenellis) makes amazingly thorough and instructive printmaking videos. In her 7 part series, she shows how to make an etching complete with hard ground, soft ground and aquatint. Below are the first two videos showing the hard ground stage.
She goes on to explain soft ground in part 3 and part 4, and aquatint in part 5, part 6 and part 7.
You can also read the Printsy interview with Mariann here.