Hey Jessica!
You'll never know how people will react on your coming out and transition, it can be quite unpredictable. You can just assume their reaction. This forum knows stories about people that was against all this stuff but then became supportive and about people who shows support to lgbt just until it came to their home. So the only way to know is try to talk. Just be sure you're safe to do this.
You've already have great advantage with your supportive friend
And now you have entire forum with wide range of people - from those who've already completed this path to those who still haven't started yet. Feel free to read something or just throw your questions

Welcome