@douginamug Is the "quick start guide" helpful? https://www.mediawiki.org/wiki/Manual:Pywikibot/Third-party_Wiki_Quick_Start
There's a category.py so if you have a list of titles to work with it most of the work is done. https://www.mediawiki.org/wiki/Manual:Pywikibot/category.py
If you don't have a list of titles and you prefer a GUI with checkboxes, perhaps ReplaceText can do the job. You just need to be careful with regular expressions as it can be quite disruptive! https://www.mediawiki.org/wiki/Extension:Replace_Text