The short walkthrough

This is the whole method run once, in the order you would run it on a live chart.

The break comes first

Nothing is measured until price has told you which way it is going.

On gold, a candle closes below the last swing low. That is the break of structure (BOS), the close that says the trend has turned down. Only now is there a direction to plan around.

Draw nothing until a break has given you a side.

Mark the two ends

The fall runs from a high at 2,440 down to a low at 2,396.