Good questions! For learning any new skill, not just music, work in small modules at first, taking time off in between learning sessions. Review the Training and Know-How section of the manual.
Moving from real to mental rehearsal means going over the same piece, rather than picking up where you left off. For example, select a few bars of music and play them very slowly. Next, repeat the action, again very slowly, but this time do it mentally. Imagine what finger you put on the key or string, how much pressure you use, for how long, etc.
[This message has been edited by Sandy Millies (edited September 09, 2003).]
