Take a ton of pictures before you touch anything. Helps you remember how it all went together when you're putting it back.

Bullet journal" isn't the same as a planner though.

He drilled that rule into you for a reason, but tools change. Your M12 stubby probably has more guts than the old 3/8 impacts he was talking about. The real issue was that specific nut being seized, not the tool size. A good compact can handle the torque rating, it just can't fight years of rust and corrosion.

Extend those breaks for bigger tasks to stay sharp.