Deal with the thoughts before hand. And when you have whatever it is you are thinking about out of the way, Do what you need to do. Don't "try" because by intending to try you are actually doubting yourself. Just look and see. Focus. Pay attention to what it looks like. How it stimulates your senses. The color. These things. Experience what you look at. LISTEN. Listen with you ears aswell as your eyes. Really see what it is.