photoshop

Lasso = L key this help me to mark where to cut Alan's head
Quickmask = Q key this helps me to correct my marking before modifying the edge of selections
Modify the edge of selection  = Select/Modify/Expand this feathers it to make it clearer and to help it blend in to the other picture
Turn the selection into a layer= ctrl J this make the head into a new layer
Move the Layer to another Photo= Move tool =V key drag to another photo this helps me move the layer of the head to the other picture
Scale the layer= ctrl T this help me chose what size I want alan head to be
Copy the Layer=ctrl J this helped me to copy the heads