You have to be careful just dropping in clips by others, as they won't always suit the terrain or other nodes you've put in before. Better dissect, and learn, then use the idea to build your own from scratch.
QuoteI am clueless as to how to achieve the basic smooth face
If you want to build from the default scene, you can increase the smallest size in the base terrain PF to start with (make it 5m or so), then you can decrease detail in the fractal warp (say 0.8-0.9). Voila, smooth mountains as a base to build upon. You want more steepness; increase variation in the pf, and increase clumping, etc.