I prefer generally not to tell too many people about my beliefs, and especially not about the ins and outs of my practice. Except with my friend who is also trad, but even then, I don't get into specifics about spells, and neither does she. We talk about ingredients we like, or about the intentions of our spells, but not exactly how we did it. I'm sure if one of us was really stumped, we would probably brainstorm together the ins and outs, though. We also talk about how we figure out what the spell will be.
As for anyone else who doesn't know, I never lie about it, but I'm very good at talking 'around' it, if you know what I mean. I mentioned in another thread about my lovely Christian friend who's noticed a change and is trying to ask me what I am. There are lots of, 'what's changed?' questions. To which I ask, 'what do you mean?' which is a fair question, really! If I knew exactly which part she felt had changed, I could just talk around that bit
Most people see me as a nature lover, many would suspect I'm a pagan (which I class myself as, also), and I'm sure plenty would just dismiss some of my quirks as new-agey-ness. I'm more than happy to project a new age vibe if there's some aspect of myself that I couldn't hide, such as my incense in the house, or any crystals I might end up using or wearing. People know I'm a big fan of meditation, and I think they see that more as a health kick, again, I'm happy to let them, think that's as far as it goes. I mean, I did initially start meditation due to doctor's orders, and it does do wonders for my health. But anyone who doesn't know I'm on the trad path, doesn't need to know my meditation goes way beyond that.
I thought I might give examples of talking around the questions. Let's say if someone asked if I'm wiccan (that hasn't happened, but it's a good example). I would answer honestly, 'no, wicca is definitely not my thing'. But, because not everyone knows about trad craft yet, I would expect most people, if given that answer, would assume, 'oh, she's not a witch, then.' So, I haven't lied at all, but I have given the impression that I'm also not a witch. Also, as mentioned above, answering a question with another question has proved helpful, but I wouldn't think it'd be useful to ask question after question in return, ad nauseum, because then I think it draws suspicion and people start wondering what you're hiding!
Another thing I've found that helps, is I might mention that I have different beliefs to other people, but I like to keep them to myself, because I don't want to convert anyone, and I don't like it when people force their beliefs on others. It's not a lie, it's 100% true of me. People usually respect that, and leave it alone, but they don't seem to feel as though I've acted overly defensive or aggressive.