8 O’Clock wasn’t too bad after getting the addon Killtrack and a pen and paper.
Jot down your rat count every lock and it can be done very quickly, it will take a few tries though, you have to familiarize yourself with the instance which takes a few laps
Once you complete an orb, it’s fully completed and your progress saved.
If you’re doing part 8 now you can reset the instance as many times as you need to. It does appear overwhelming, it doesn’t help that the “count rats each time you complete a lock” isn’t highlighted anywhere. (It is mentioned deep into blah blah blah videos and comments but it needs to be known before starting, each lock, kill and count rats again)
Once it clicks with you you’ll see it is straightforward enough.