Actually...
Hi Frannie,
Actually I don't think it will change the cards. I read in different books that no matter what you expect, how you shuffle or who shuffles the cards, tarot is always going to show what you need to know at that specific time in your life.
What it can highly be affected is your capability to perform an objective reading. And this I say based on my own experience. You want the cards to show a certain pattern, so one way or another, you find this pattern in the reading.
Learning to be objective is a hard and long process. I guess it takes many, many readings and exchanges with others. And I think that it also has to do with our philosophy about life. If you expect the universe, or God or forces that you care for to give you the best available at any given time, you will trust that whatever happens will be the best for you at that time. This can take the anxiety state away from you and make you read more accurately. (Of course, this is easier said than done... LOL).
Best,
S.