First of all, this type of misdirection has to be contextual. That means that it has to fit the context. There are two basic types of misdirection here, one where you want the person to look somewhere else. You should only use this when you are not supposed to be doing anything, or at the very least not anything important, such as when you are shuffling or cutting cards before the trick is supposed to believe.
The other type is when you are doing something, you want the spec to watch, but would prefer that the person not watch too closely. A DL is like this, or any kind of count. If you are trying to get people to look away on a DL or count, you need to practice more. For this, one suggestion is to talk to the person or ask questions, not so much to make them look away but to break their extreme focus. When I do Think, Touch, Turn I am telling the person to watch closely. I still chit chat, and will keep my hands moving, but I darn well better have the moves down cold, or not do it.
Also be careful about just stopping an effect in order to ask about someone's hometown, or to say something about his or her eyes. Laypeople understand misdirection, and any out of context, effect stopping, comments like, "Hey look over there," are easy for laypeople to spot.