I have it, but I am still learning. Can't be of much help.
As for cutting one image out and pasting it onto another. I have found it is easiest to crop most of the crap off of the image you want. Cut it, then open a new window. Paste the cut image into it, this way you have a transparent background. Erase the stuff you don't want. Copy it again and paste it into the new image. IIRC, Control-T (?) is what will let you resize.
As for tutorials, I just ask my brother. He plays with it for a living.