So here's my situation, and to most, it's incredibly simple: I'm to create an image of a huge baseball player standing behind the US Capitol building. I have a pic of each on hand, I know I'm supposed to "cut a slot" along the roofline of the Capitol Building to stick the guy into so the sky is behind him and the building is in front of him. I also know I have to perform this task with a Layer and a Mask ... and that's about it!
The online manual tells me in technical terms what these functions are, just not how I am to apply them to this specific task. Could someone come to my aid and explain - in complete club-over-the-head-DUH! steps - what it takes to cut this slot and make this happen?
Thanks ahead of time, and please remember ... we all had to start somewhere.
Alan in D.C.

and Node
tool for this.