In the "unrepresentative swill" that make up my family. My aunt and I are on the outside along with my sister (who is extremely supportive of me

). This makes it her my first choice in telling I'm trans as if it goes well I will have more help, if not she is not connected enough to the family to hurt me (I hope). Now with her living a 14 hour drive North I'm writing her a letter, or trying this being the problem.
I've been staring at this blank sheet for awhile now, trying to figure out how to open. Once I start I'm confident I can carry on and finish. Last time she saw me was July last year she while she recognized me she didn't recognize a picture of me a few months previous when I had light make up on and wearing similar clothes. Usual straight talk how is this for an opening
Dear Aunty blank,
Hi this is gypsy I am transgendered and transitioning from male to female
Then go into more detail as I write and that I have been living full time for a few months now fairly successfully in my opinion. I'm not really looking for shock value but straight talk and honesty that we where raised on.
Thoughts?