This has to be one of the fastest to learn, big impact tricks I have come across. It is simple, fun and effective. If you are a beginner you will be able to master this. I watched the DVD practiced it once and then showed my husband,he was impressed (this doesn't happen too often). It is also easy to reset, I do it whilst packing away the cards followed by one move when I pull them out again. Also all but one card can be handed out to inspect.
Not a trick I would do twice for someone.
Very small chance gimmick could be noticed by very observant layperson, but this should be overcome with good handling.
Size of your hands is no issue, as long as you can hold 4 cards you can do this trick.