[NTG-context] How to learn ConTeXt?

Hello everyone! My question is as in subject: how to learn ConTeXt? And another ones: How to install ConTeXt? Manually or from, e.g., TeXlive? I would like to typeset in Antykwa Torunska or Antykwa Poltawskiego. Setting \setupbodyfont[...] yields errors about missing ec-ant* fonts (I use the TeXlive 2004 installation, the same thing happened in TeXlive 2003). Greetings -- Marcin Borkowski