Do not doubt yourself
No matter in life or at work, self-confidence is very important. Do not lose your confidence because of the comment others say to you. Whether they judge you on purpose or not, just keep away from these people. And you also shouldn't doubt yourself in a gambling. When you using the exchanging cards devices , invisible marked cards, remote scanning camera ,or a winner analyzer system, you should believe that others won't notice what you do at first. Second, you should practice and practice, so that you can use these devices flexibly.