This is a picture of my wife and I. She shot the picture of me and I shot the pictures of her. The background of her was better of her so I used the main shot of her. I wanted me behind her so I had to make a layer in Photoshop of just her and make a layer of just me in the separate photo. I then moved the layer of me to the main picture and arranged layers to have me behind her. Then the head room was not enough for me so I have to take the top part of my picture and add it to the top of the main picture. So we have two pictures cut and arranged into four layers on one picture. After it was all put together it was cleaned up in Photoshop to look like it was just shot that way. This was shot before I had my Nikon and did not have the skills I have in Photoshop now so don't look to close. Shot with a Kodak point and shoot.
If you are using photoshop while you have your copy slected you can resize it and at the same time you can use the eraser to carfully erase things like bars out. That is the down and dirty way. There are other easier ways to do it. Do a search on you tube on copy cut and paste I am sure you find some information on how to do stuff like this.
Did you see the photo I redid of you lifeguard tower? See who is in it. This was done with layers. Nothing was erased. If you erase you will never get it to look correct.
Now explain how you did it