Just try to make it as simple as possible. People can feel threatened when you overexplain things.
^This.
Am I too late?
Oh well. x3
I agree with the idea that if you're going to explain it, just keep it as simple as possible. There's really no need for people to know anything but the basic stuff. Chances are the more you explain and make a big deal out of it, the more people will feel confused and threatened. Sure, not all cases are like this, but most of them are. Keeping it simple makes me way better most of the time.
When I decided to tell my mom, it was just a matter of "hey, mom, check this out", sat with her in front of my laptop and showed her con videos, fursuit pictures, pictures of collars, furry artwork, music, etc. This is really all she needed to know since those are the only things she will see me doing. But I'm lucky that I have a mother that acts like a very open minded teenager
Her reaction was "Coming from you, it doesn't surprise me", I've been wearing a collar on and off for years now, and "when you finish your suit, I'll be the one testing it"
My sisters were pretty much the same, the younger one loves the idea of fursuits an even offered to be my suit helper if I let her go to cons with me, and my other sister simply accepted it with a "you're such a freak", a grin, and a "and don't you think about getting any fur on my bed".
My dad however, I didn't explain anything to him. Our relationship is... we strongly dislike each other, so I don't bother him as long as he doesn't bother me.