Having a mentor is important and valuable. Your mentor sets an example, your respect and admiration of the mentor are what keeps you focused on your goal, and you have access to all the wisdom that mentor has acquired.
A perfect example of this is in doing an exercise discipline. Many people work out on their own for years without making a significant change in their bodies. I can see why that is perfectly... you will most likely continue to work when you want to and how you want to, but continue to neglect to take certain corrective and balancing moves that would complete the workout and transform your entire structure.
Callan Pinkney, the creator of Callanetics, has been a mentor to me. When I follow her program even for just a few times I am amazed at the sheer genius and the dramatic immediate results. Don't get me wrong, I have been back at the gym for months now working out five times a week just to get ready to do them again, right after my accident I wouldn't have been able to do them at all! If I try these exercises when I am really out of shape they are really difficult and results might not be immediate. However, there is a thresh-hold after which doing these exercises will quickly sculpt my body into great shape fast. As part of my test of the power of mentor-ship, I will do the Am/pm program daily and I will do the advanced program at the end... I want to see what can be accomplished in 10 days.