[Eugene Constable] “(He might say ‘BALANCE’ and the word balance pops out of the palm of his hand as text and momentarily rests on his hand. and so on.)”
EXACTLY how the words appear from the palm and how and where the camera and palm are positioned will greatly impact the amount of post work – ie. if rotoscoping will be involved.
Keep this in mind when planning the shot.
With respect to your Qs – the only rotoscoping that may be required is covered in my first paragraph. When tracking (not the palm) the wall or talent, mocha should be able to do a good job. If you do require markers, on the wall, you can place these such the talent does not crossover the markers. This precludes you having to key or roto out the markers.
I have no idea on lighting other than to keep it muted so as to allow for maximum tweaking during post. This is an area where you should develop ‘looks’ prior to the shoot.
Mocha is great for tracking hands, head or seemingly non-planar surfaces. Take a look at face replacement mocha tutorials to see examples of planar surfaces that exist on a face. Google “face replacement mocha” to find such tutorials.
HTH
RoRK
Intensive mocha & AE Training in Singapore and Other Dangerous Locations
Imagineer Systems (mocha) Certified Instructor
& Adobe After Effects CS6 ACE