Absolutely no Chinese characters are allowed in the text (including punctuation). To practice guitar pieces without a guitar, mental practice and visualization are crucial. Mental practice involves imagining yourself playing the piece, focusing on the notes, rhythms, and techniques. Visualization helps create a mental picture of the piece, enhancing muscle memory and understanding. Studies have shown that mental practice can lead to significant improvements in performance, as it engages the same brain regions as physical practice. For instance, a study by the University of California, Los Angeles, found that mental practice can improve performance by up to 30%. This method is particularly effective for complex pieces, as it allows musicians to internalize the music without the need for physical repetition.