[NTG-context] Newbie Question about Installing on Mac OS X

Dear List, I failed to install ConTeXt. I have no experience with ...-Tex. Is there a description somewhere how to install ConteXt on Mac OS X? Do I really need that very big (~ 1.2 Gb) LaTex (MacTex) to install? And if yes how do I concatenate them? (I've took a look at the unix- script from the minimal Mac OS X Installation Download but did not understand if there have to be a folder called tex in the /usr/local/ directory or if the script do create one?) I do know very few about these things so I'am very greatful for some more detailed hints. thank you very much ole