Rather anticlimactic, on both occasions. As both bisexual and polyamorous, I sometimes feel I should be more out, more actively visible. I should force people to see me as an individual, to admit that the choices I have made for my lifestyle are as valid as their own. Then it occurs to me that they usually do see me as a person. And they accept me as I am, even if it takes them a little time to get used to my lifestyle.
People usually figure it out on their own.
If they don't, or aren't willing to, I drop a few subtle hints. I have one friend that is a few years older than I am, raised in one of the fundamental religions, to whom homosexuality and non-monogamy are the height of sin. I am going straight to Hell according to her doctrine. She took a long time to catch on, but one day as I was talking about something with a friend while a group of us were at lunch, I could see the lightbulb go off. Suddenly, she knew.