for me it was T4 (not T3)

It's easier to follow Step 19 & 20 first and then come to Step 18 (this step). Doing so will make it easier to remove that speaker connector easily holding the cable of speaker without having to use a pry tool.

Clips removal: its hard with finger to pull. It's better and easy off with a pry tool (I used a flat twiser) to pry from the bottom gently for each clips. It was so smooth and easy.

me too. Got it done with a iFixIt PH00 screwdriver.