Expectations before week 12 workout: man, this is gonna be SOOO easy, it's half the volume I was doing last week, I was able to do the whole 5 sets, what could go wrong?
Implementation during workout: you know what? I'll double-triple-check my form and correct every possible detail.
Realization during workout: OMG! I've been doing it wrong this whole time! THIS is the real thing and it's harder!
Final lesson: reboot the last micro-cycle all over again. There's more than 1 ego, you put aside one, its friends are still there tricking you.
(sorry, I had to do this
)