I wrote a new chapter to Meta, mainly for beginners. I hope it will be easier to start with this description. See http://meta.wikimedia.org/wiki/Pywikipediabot/replace.py#Overview. Please check it and complete if necessary. (Article on fixes.py is the next important task.)
Thanks a lot - such manual fits perfectly well into my (very long term) plans for creation of a "Script WikiUserInterface" bot... ;))
Greetings