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Learn how to replace skies in Photoshop with this tutorial from Denny's Tips. Most of the time, replacing skies means that you have to spend a lot of work cutting out the sky. But in this tutorial, you'll learn how to replace skies in a fraction of the time and effort. You'll also learn about luminosity masking and clipping masks.
The video also mentions the Sky Replacer Photoshop actions. These actions will let you replace skies in just a few clicks and is made with the same technique shown in the video. There's also a pro version which will give you two additional actions for replacing daylight and deep-blue skies as well as a bundle of 23 sky textures.