A Few Tips before watching
1. Take the picture of the subject with a plain coloured (wall / sky etc) behind it so that the magic background eraser can easily recognise the part to be cut. You can also play around with the “Levels” to achieve this effect
2. If you are having trouble with the eraser tool or the bacground is too complicated to cut, just use the magneti lasso selection tool to draw a rough border around that part. Then feather it a good amount so that the edges get softened a bit
3.If you still have trouble, just use the normal eraser tool to rub out any remaining parts
4.You can also try something like this with multiple pictures. Use the Rotate and Perspective tools if you need to!