To tell your friends that you have decided to follow the Wiccan Path is a hard thing to do. Most people these days are so closed minded that it isn't funny. If you feel that they are true friends who will support you in your endeavors then the best thing to do is just come out and tell them.
If you feel some bad comments may come your way if you tell them then it is best to keep your beliefs between yourself and the Lady.

Blessed Be