This video shows how to use some basic image editing techniques to replace the face in an image with another face. If you have any questions, I will be glad to help you, but *please* be specific and detailed in your question, otherwise it risks being ignored.
== Keyboard shortcuts mentioned ==
Ctrl-L: Show the Layers Dialog.
Hold Ctrl (when scaling): Maintain aspect ratio.
+,-: Zoom in/out
Hold Middle Mouse Button and move: Pan (move within) image.
],[: Increase,decrease radius. (New functionality, you might not have it in your version.)
==Technical details== The video was recorded with recordMyDesktop using GIMP 2.3.16 on Ubuntu 7.04 beta, and scaled/sharpened/encoded with MEncoder, using this command: mencoder face-replace.ogg -vf scale=320:240,smartblur=4:-0.5:-10 -oac mp3lame -ovc lavc -af volume=30 -lavcopts vcodec=mpeg4:vbitrate=2000:vqmin=2:keyint=50 -o gimp-tutorial-face-replace.avi
After encoding it, I discovered that Directors can't upload videos longer than 10 minutes anymore :(, so I used MEncoder to losslessly split it in two parts.
Feel free to spread the video in YouTube-embedded format as much as you like.