Not sure about line 4 - I would be wary about making all directories 777 and all files 666.
I'm basing #4 off of the install instructions; in fact I prefer files 644 and directories (other than cache and templates/compiled) 755.
@Scriptkeeper
Language files and templates must be 666 if you plan to use the web-based editors on them.
I don't edit my wordlet fiels, so I'm unsure as to if they're updated completely