Hand baggage is usually done at the gate....
Hand luggage is never weighed at the gate.
also what about your hand luggage if and when will this be weighed if you go straight to security??
It won't, it will be just like booking a flight with no luggage nowadays, you just go through security, down to the gate and as long as your hand luggage is within the prescribed dimensions, on you get. (many with hand luggage that exceeds the max dimensions too unfortunately)