No need to worry folks. Whenever you suceed in pulling a hard move off, it never seems that hard anymore wink !
Okay, make sure your energy bar is low enough and you`re in MAX (you probably know this already though.) Then when the opponent does a jumping attack at you, pull off her MAX super (back, forward, down, down-forward & B&D together.) Straight after press B,C&D together and the background for the hidden SDM should appear. Then you can just sit bcak and enjoy the damage drool_2 !
Even so it`s sometimes awkward to pull off. However, I hope this has explained it`s use to you and you can use it more easily.
Bye for now (People`s Elbow buttrock !)