Oh God, SOMA. Almost my first job as a shiny holding chum straight out of IOT at Marham was to do a big update on the system. No training, "Here's the manual, crack on". I forget how long it took.
Individually dismantle every link that a particular page had within the page and to all other pages, make the change, re-mantle (?) every link backup again. Repeat for what seemed like an infinite number of pages. Repeat at least half of them because the required changes were in no particular order and many were on the same pages that I had already done.
I was very grateful to the WOC residents for the endless cups of tea!