to use it expertly

When u do sth to cheat people, will u nervous? Will u trembling? So, what would u try to do if u want to deceive others successfully? Hahaha, take the playing marked cards as an example. First, u need to calm down, just act as u playing the normal cards, because no one know there're marks on the cards.And then, u should use the invisible ink marked cards expertly, practice and practice, until u won't sell urself out.Keep the infrared contact lenses correctly. The most important thing is remember the distant between the cards and ur sight in specification. And good luck.