I am not sure what you mean by that term... I assume you mean the left low, right high, roll the shoulder defense made popular by Toney and Mayweather?
Look, this is not rocket science. Back in the day, EVERYBODY did it that way. Check the old college boxing manuals-they did it that way in the 1940s and 1950s.
Do not ever reach out with your right hand to parry or block punches. Angle your left foot so you are not squared up- turn your left hip. You cannot roll your shoulder if you are squared up.
The hardest parts are picking off body blows with your left arm and catching the left hook.