To me unschooling is simply child-directed learning. I see myself as a facilitator: I'm available to help my kids pursue their own interests -- to the degree that they want my help. As some others have pointed out, we the parents are aware of resources our kids are not, so it makes sense for us to mention things our kids might be interested in, such as a book we think they might enjoy. The important thing is to continue being led by their interests as we're introducing a new experience.
If I have a new book I think my six-year-old might enjoy, I'll ask if she'd like to hear it and only read it to her if and when she wants to listen. Then if she's not interested I stop; especially when it's a book I'M introducing, I'll periodically stop and ask if she wants to hear more. She does feel pretty comfortable just stopping me and saying she'd like to read a different book or do something else, and I want her to keep on feeling comfortable; I never want her to pretend to like something just to please me.
I do tell people we're unschoolers, 'cause it just seems our approach to life is so different from that of other homeschoolers; I guess they'd figure it out without me telling them, though. None of my homeschooling friends unschool, and a major part of their energy is focused on "getting" their kids to learn and persuading them to like learning. Those concerns just aren't relevant to me. I realize my oldest is only six, but I find it hard to believe she'll just retreat to her bed and quit learning when she turns nine or thirteen. Of course, I have no problem with keeping the TV off most of the time, so that may be why my kids seem naturally involved in the world around them.
As they get older and want to take certain interests further, I want to help them get involved with apprenticeships, volunteer jobs, or home-based businesses of their choosing. I'll be talking to them about this as they grow, encouraging them to visualize what they'd like to be trying out. I definitely won't force them to do apprenticeships if they don't want to -- but they have such a strong interest in the real world and in doing the things adults do, I can't imagine them suddenly losing interest and NOT wanting to interact with life on some level as they get older.
Truth be told, I probably won't be needing to talk about it that much, if at all. My six-year-old is constantly coming up with business ideas, and loves helping her dad with our worm business. My husband and I are also trying to learn to use a drop-spinner; we'd like to raise Angora rabbits and spin the wool into yarn for our own use and for sale, and I have a feeling both our girls will be interested in this as well. It's just natural for kids to talk about what they want to do in life -- and I'm excited to be able to take my own kids seriously and let them get started now, rather than saying, like my parents said to me, "You've got plenty of time to decide; your job right now is school ..."