A little pearl of wisdom from the Wiccan clan that I am a part of with a heavy dose of paraphrasing "Everything she touches changes".
We change to grow and when we grow we change. In our group is it encouraged and expected for those that don't grow cannot facilitate growth in their future students. In order to grow you have to pull out all those shadows that are within yourself, examine them, learn from them, and then let them go. But don't think for a second that is a once and done job. Some of those shadows have been stuck in our personal closets for years. They have grown roots and have shaped the people that we have become. THOSE shadows may need to be peeled back, layer by layer, and it can often feel as if you are peeling back your own skin.
If you have those shadows (and believe me, I have never found anyone that didn't; in some form) you may need to seek counceling, either from your spiritual advisor or a professional licensed counselor.
Thats the toughest part of growth, and its a lifelong job. My facilitator calls those shadows Rats. And she was right. Those hidden rats will eat away at you, they will undermine you and they have to be dug out and exposed to the light. Once exposed, you will recognize them and eventually it will become easier to find them and you will become stronger for it.
I didn't start this to make growth sound like a scary prospect, occasionally it can be, but its worth it in the end.