An interesting thing about misdirection is that you don't have to misdirect the eyes, just the mind. In other words, providing your audience are thinking about something else, they can be looking straight at your hands and still not spot anything provided your movements are smooth and relaxed enough. On that basis, a line like, "Now, you need to watch closely, I don't want you to miss anything", executing the sleight on the word "watch", can work well, if you deliver the line with enough authority, as if it's a genuinely important instruction. People's mind goes into "accepting instruction" mode (that's not the official psychological description, but you get what I mean), so they wait until the end of the sentence before enacting what you've asked them to do. It's a similar idea to the psychological stop force from ECT, where you use the timing of your instruction to indicate where they should stop you.