The Twins Photoshop Editing

I wanted to make this kind of picture since a few years ago. And now.. walaaa.. It's much easier than i thought. I took a picture of mine with my camera. I set the timer with 2 shoots. Now I have 2 picture with same background but each one has me with different pose.
I combined those picture using adobe photoshop. I put the second picture in a new layer on the first picture. Then I erased part of the second picture so i can see there are two of me as if it twins. I finished it with a little blur effect. I'm not a pro, so it was still not good enough. But.. it's OK for me :D
This is the result.