This works best as a reversal pattern so identify a previous uptrend

Wait for the MACD to signal a sell and for the 1-2-3 set up to be in place.

As the market pulls back to point 3, the MACD should remain in sell mode or just slightly dip into buy.

Place a buy entry order 1 pip below point 2

Place a stop loss order 1 pip above point 3

Measure the distance between point 2 and 3 and project that forward for your exit.