Back to topic, heres some thing that suprised me:
Keep stacking on the weight, its very easy to do the same sets same weight every week and feel like your muscles cannot push any harder at the end of the last set.
Suprise yourself, stack on the weight, pysch youself up and go for it. Maybe you get 1 or 3 reps, maybe 6 or 8, but you will be suprised if you believe you can (within reason) you will do it.
If it requires a spotter ask someone and go for it.
Keep changing your routine, same same but different