When doing yes or no readings, I have one deck that works best for it. I always shuffle the cards while concentrating on my question. Then I either flip over the top card or if one flies out while shuffling I use that card.
If I pull from the top of the deck, upright is yes, reversed is no. If I use one that flies from the deck it depends on how it lands. Upright yes, reversed no. If it lands sideways the answer is a maybe. At this point I draw the top card for clarification on what would be the determining factor.
I have always gotten good results with this.