MuseScore is a free software that allows to "create, play and print beautiful sheet music". It can become the perfect practicing companion: always available, never makes any mistakes, keeps the tempo like a metronome and it doesn't cost anything.
Why bother with mandolin techniques? That is the question…I spent thirty years of my life teaching in high school. I read about everything I could find on the art of teaching. But I must admit that once in a while, some situations still make my jaw drop. Recently, a music teacher told me that almost all of his students were unwilling to play technique works, exercises, scales, etudes, etc. If someone thinks he can cut short his learning by avoiding techniques, he is the perfect candidate to become an early dropout. He will very soon get tired of knocking his head on the wall and will succumb to his limits.
Practice with your head and play with your soul. If we play a piece slowly, while placing each finger precisely at the right place on the finger board, striking precisely the two strings of each course with the pick, it helps "awaking" the muscles of the fingers, it also helps to relax the right wrist and to put us in the right mood for a good long daily practice.