May I make a suggestion or two??
Coming out as Trans is, for lack of a better term, a big freakin' deal. I think that, at least with close family and friends, this is something that warrants a face-to-face conversation. Something that you're going to face is people not taking you seriously; those that might suggest that you're not really committed to transition. It would be better if you start out by being very direct in your approach..... in person. Save the letters and emails for folks that you don't see often. Talk to the person ahead of time and set aside an hour with them to "talk about something very important," when you won't be interrupted.
Write down what you want to say and practice it in the mirror. Anticipate negative reactions and be ready to counter them.. with a smile. Take the stance that whoever you're coming out to may be confused and/or upset; be prepared to help them understand and be ready to walk away for the moment and continue the conversation after. Don't be adversarial. You should be the one in control of your coming out. Control yourself because you can't control the reactions you'll face.
Don't assume that you've lost someone because of a poor, initial reaction. This Trans stuff takes awhile for some to get their hands around. Be patient. This process may carry out over several conversations (especially for parents.) Lastly, you might want to do a little better than pamphlets and buy a book... I'd suggest "True Selves: Understanding Transsexualism: For Families, Friends, Coworkers, and Helping Professionals" by Mildred Brown. Amazon has it, used, for under $10. It's so worth the investment!
Coming out can be very liberating! I remember about a month of giddiness afterward...like a great weight had been lifted from my shoulders. I credit my successful, early transition to #1, having accurate information and resources available; #2, being patient and willing to help others understand and being open and honest; #3, Having a sense of humor about it.
Good luck and be well!!!! You're going to be okay. :-) <hugs>