The problem is that the instructions assume that you know what you are doing. But if you knew what you were doing then you wouldn't need the instructions now, would you.

For example:

step 4: type $mktexlsr

Hmm. Where should I type it? Into LaTeX and then typeset the document? Into the Error box that gets generated when LaTeX is trying to typeset?

Noooooooo into Terminal. Oh, I see, WELL WHY DIDN'T YOU %#@&#! SAY THAT THEN.

PROBLEM: I typed mktexlsr into Terminal and it doesn't seem to like it (get some error message about it not being able to write to the directory.

ANSWER: You need to type $sudo bash into terminal and hit enter, and then type your administrator password into terminal BEFORE you type mktexlsr into terminal.

OH YEAH??? THEN WHY DIDN'T YOU %#@&#! SAY SO IN THE INSTALLATION INSTRUCTIONS

AAAAAAAAAAAAAAAAAARGH.