First you have to render the image of yourself from the background, usually using the pen tool. Then you save the image as a PNG file so the transparency remains. Then you add the rendered image into the other photo and there you have it
photoshop
no
You can use photoshop or another picture editing program to digitally edit the picture.
Image > Image Size
Photoshop is one such tool for that. Pixlr is another tool which can be used like Photoshop.
Find the picture and right mouse click on it select copy and then paste. Remember that Photoshop pictures when saved are defaulted to its own PSD file name. If you want another file type you must load the picture in Photoshop and then you must "save as" what ever picture type you want
I assume you have two pictures open - one of them of you. "Select" yourself (use any select tool). Copy it (under edit) Paste selection onto the second picture. Move it to where you want it.
PHOTOSHOP
Photoshop is picture editor,what you mean?good picture editor?best free picture editors are GIMP and Picasa,i recommend to you Picasa
In many different ways, first is to place pictures in same document. To place picture above another you can from Bridge: choose 2 pictures (hold down Ctrl while clicking second picture) then go to Tools > Photoshop > Load Files into Photoshop Layers or from Photoshop: File > Scripts > Load Files into Stack..
Yes. It would require a good knowledge of certain programs like Photoshop
You can use Photoshop to take a picture of yourself and edit it to make it look like you're someplace else