[li]can give you the feedback and motivation you need to move you along.[/li]
[li]can suggest tips and tricks that might save time - things they've learned themselves over the years.[/li]
[li]can suggest effetive lesson books and exercises.[/li]
[li]can look over your shoulder and let you know when you're doing something incorrectly (when you might think you're doing it correctly)[/li]
[li]can stop you from developing bad habits, bad grips, bad technique.[/li]
[li]can help you learn how to read real music notation.[/li]