No, you cannot give the cards out before or after the trick. The gimmick is made in such a way that cards can be handled very openly and you even have the option of using a signed card as part of the trick that could be given away.
The gimmick is very subtle, and will blend in with your normal cards. Personally, I put the gimmicked cards in my normal deck. I do a handful of tricks and then transition into this effect whenever seems right. Then I continue on with other card tricks.
Josh