My first performance in front of an audience was coming up soon.     I tried as hard as I could to remain calm, but my heart was racing. I stared down at my sweat-covered, shaking hands.     I looked up again at the audience, realizing that these were real people. They were not just my mum and dad, who would say, "Good job!" even if I messed up the entire piece.     What if I had the wrong music? What if I played the wrong notes?     As it turned out, I was never able to answer these questions because the spotlight   was waiting for me. I grasped my hands tightly together, drying off the sweat.     Slowly I walked to the mud-brown piano in the center of the room. It contained 88 demanding keys, which were waiting impatiently to be played. I swallowed the golf-ball-sized lump   in my throat and sat down. Slowly, I opened the music. Next, I rested my still shaking hands on the ivory   keys.     As my fingers played across the keys, I was becoming more unsure of my preparation for this moment. But the memory of my years of training came flooding back. I knew that I had practiced this piece so many times that I could play it backwards if requested.     Although at one point I accidentally played two keys instead of the intended one, I continued to move my fingers automatically  .     My eyes burned holes into (were fixed on) the pages in front of me.     There was no way that I was going to lose my concentration. To keep this to myself, I leaned forward and focused carefully on the music.     When I came to the end of the page, a warning went off inside my head: DON'T MAKE A MISTAKE WHEN YOU TURN THE PAGE!     Needless to say, I obeyed myself with all my heart and mind. And, proud of my "page-turning" feat  , I finished the rest of the piece without making a single mistake.     After the final note died away, a celebration went into action inside my head. I had finished. I had mastered the impossible. What did the author feel about her performance?
She thought it was comfortable and successful. She thought it was very difficult but successful. She thought she had never made a mistake during the performance. She thought she played through the piece carefully but light-heartedly.