I Came across this photoshop editing video tutorial a while ago an found his videos really simple and effective.
Take a look at this video from fellow photographer Scott Voelker
this is a very simple and effective technique that is easy to follow.
I used a similar technique to get the photo of Scott for this post from the photo I had of him.
You can see the original shot here, and from it I got the photo of Scott by covering up lisa – Horry Lisa! no offense 🙂
So you can see using this method you can apply it to different shots
If you liked that video you can see some more from Scott by Clicking here