If you have ever taken one of my Photoshop or Photoshop Elements classes, you know that I am a big fan of improving the skies or replacing them altogether if they are unfixable.
This YouTube video demonstrates one of the most effective and easiest ways to replace a sky that I have come across. It uses Photoshop in the video, but since Photoshop Elements includes the Refine Edge Tool, the technique should work in it as well. I have not tried it yet.
The video was produced by Anthony Morganti.