Hi eipsa
Interesting questions. Something that I'm having to think about at the moment. I self-dx'd only a few months ago. Then saw a psych who quickly confirmed (luckily none of the horrible messing around for ages that I read that some people have to suffer).
Before I went to see the psychologist, I did speak with a very compassionate and supportive friend who encouraged me and was entirely positive. I have since told two very good friends and my sister, to all of whom it has definitely not made any difference at all. (Thank God!)
One of the friends did say that she couldn't see how I was Aspie because she'd met AS men through her work and I am nothing like them. Not that she was doubting my word, but I think I'll have to sit down and explain it all more fully to her (which feels a bit like the spotlight on me and not too comfortable - but she IS a lovely kind person so I don't think it'll be too difficult).
Interestingly, I have a good friend of many years who seems to be avoiding me after I said I wanted to talk with her about my neurological status (didn't mention ASD) and the issues that it brings up. This friend is actually a psych herself...hmmm !
I was at another friend's birthday party yesterday and some woman started talking about AS people and how 'they only feel four things: anger, sadness, fear and happiness, nothing else, nothing subtle in between, no love.'
I felt like wiping the floor with her - ignorant jerk. I did think about egging her on to worse excesses of know-it-all blather and then just saying 'oh, by the way, I'm AS...I feel love and all sorts of things - passionately' just to see her stunned and, I would have hoped, embarrassed reaction. But that would have meant me revealing my dx to all and sundry when I really didn't want to.
So, yes, I think you're right to think about this carefully. Choose the right friends to tell - ones who you are sure will be supportive and who will respect your privacy. The thing is, once it's out, it's out. You then have no control over who knows and says what. The trouble is that there's so much ignorance about ASD out there. Also, I have a sense that maybe the vast majority of employers just wouldn't understand - and some AS people could lose their jobs over it (regardless of discrimination law, they can always find a way round these things).
But telling close friends has definitely been a good thing - it means I can be me and more comfortable with them (also I can now easily ask about e.g. what their expressions mean, when for years I'd just had to guess what their faces meant; or if they were seriously saying something or just joking me). You do need some support with this, it's a major thing to discover about yourself and it does change your life.
let us know how you get on and take care