Good question Laurel, I have a similar issue this weekend, I'm meeting up with some old friends that I haven't seen for about 3 years to commemorate the passing of a mutual friend.
They have no idea about my transitioning, not that I have hidden it, we just don't meet up that often and don't live in the same area. I am feeling a little apprehensive, I think my friends will be accepting but I am preparing myself if I get a bad reaction, if it comes I'll deal with it with dignity.
I know what you mean when you say about the initial stress coming back, for me it's the fear of the unknown reaction, and bringing up those feelings of coming out again. I am coping by knowing I have come a long way already, and that has given me a lot of strength. I'm a much happier, settled person now. If they can't cope with the news then they will miss out on a better me, their loss (also mine because I will be disappointed).
You have come a long way Laurel, you are a strong woman, show them you are confident and happy, if they are a good friend they will be happy for you.
Good luck [emoji4]