Sculpting in plaster

I've been trawling Youtube for some sculpting info. However, it is late at night and the sound on my computer is busted, so I have been watching these clips without any volume. I have no idea if the commentary is any good. The visuals tell me what I want to know, so turn your speakers off and enjoy.

Using a butter knife, a chisel and a foam rasp to carve a simple shape from a block of plaster. The last minute is sped up, so skip to here if you like.

http://www.youtube.com/watch?v=C2pvq_RC3uw

How to use various sculpture tools on a large plaster object.
http://www.youtube.com/watch?v=UozFKqGqfNI&list=PL08D841503D1717CE

http://www.youtube.com/watch?v=xiDHbKOoQao&list=PL08D841503D1717CE

http://www.youtube.com/watch?v=uDvNF4LvV9c&list=PL08D841503D1717CE

http://www.youtube.com/watch?v=mDZWyob0jQM&list=PL08D841503D1717CE

http://www.youtube.com/watch?v=Eqqlius3ylU&list=PL08D841503D1717CE

http://www.youtube.com/watch?v=29eT2ndGIKg&list=PL08D841503D1717CE

http://www.youtube.com/watch?v=pvNZlmwmJvQ&list=PL08D841503D1717CE

http://www.youtube.com/watch?v=Ro0Giymu-pA&list=PL08D841503D1717CE