You could try visualisation (ie, seeing yourself playing in your mind's eye). This can be effective. Also, you can listen to some of the great pianists playing (both what you are learning and to broaden you musical horizons generally).
Gieseking is said to have learned and studied a great deal of music simply by studying the score. It was very effective for him; so much so that he once went on a tour playing nine concerts, seven different concertos in eleven days.