With the two (or more) images open in Photoshop, select > copy > paste one image on top of another. You may want to resize the top image you have pasted. You can do this by Free Transforming it (edit > free transform, or command T), remembering if you want to constrain proportions you will need to hold down the shift key whilst resizing.
Layer 1 ready to be free transformed.
Layer 1 transformed and moved into desired position. I will now hit enter (return) or the 'tick' on the properties bar to commit the layer.
I will now add a layer mask to Layer 1 by clicking on the 3rd button along the bottom of the layers palette.
With your paint brush tool selected, and the colour set to black, start painting over the parts of the layer you want to hide.
Black hides, while painting with white reveals, so if you make a mistake you can easily paint it back in with white.
Whoops... I hid too much of my layer... That's ok, I can reveal it again by painting with white!
Masks are very handy, as you aren't actually erasing or deleting part the images, they are always there to hide or reveal as you wish.
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