This is an article about pasting one face over the top of another face and using a layer mask to blend it. The only automated parts are the object selection too

This is an article about pasting one face over the top of another face and using a layer mask to blend it. The only automated parts are the object selection tool, which helps you select the face for copying and pasting, and the match color feature, which helps you match the tone and brightness of the photo you're attempting to blend on top of. I used to do Photoshop image manipulation for work. Performing a convincing face swap with the tools mentioned in your article was difficult unless the light sources, face angles, and focal lengths of the cameras that took the photos happened to match very closely. You could paint in your own lighting if you were very skilled, but it's the sort of thing that took years of practice to get good at, and it still wasn't very convincing most of the time.