There are a lot of emotions which come up for people when having to confront the idea of a polyamarous lifestyle for the first time. I understand that you are seeking support, we all need support in our lives. But- some people will not be able to support you in this no matter how close you are to them. I think it's best to feel a person out and if it becomes obvious that they are not going to be able to offer support, then it would be best to seek the support elswhere.....from someone who is able to give it.
The key to life is in being fully engaged and peacefully detached simultaneously and authentically in each moment.