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I have a large green screen here I have used for shooting some mainstream stuff, you need VERY GOOD software to use that. This isn't really a greenscreen technique, more of a "tracking" issue. Basically, you find clips as described above (similar colors, etc) and you mask out the original head. You then map the celeb head into place. Advance technique is to use the motion of the original head (usually eyes or nose) to provide a realistic movement to the head that would match the original clip. Issues happen if your original mask is too large (lose some backgroup) or the replacement head has motion in it (which you can fix by first running this through image stabilization and tracking software to remove all the movement that exists).
It really isn't the toughest thing to do, but it takes a ton of time to do properly with much mroe time in research.
Alex
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