Exfoliating once a day is not enough for me. Hell, I plucked 5 hairs off the side of my chin 2 months ago (they're ones that I always miss while shaving) and I ended up with 5, huge, monsterous zits that're going to take another 6 months probably to un-redden. Blargh, no matter what I do hair's such a bitch. Except shaving my arms.
I've never used nair, but I used veet. The result was a chemical burn that bled that's just now, 15 months later, looking like it'll go away. That was on my chest - be careful in the chest, especially the nipples, and other areas like the thighs (got some burns there from it as well, though they've mostly healed by now), and around any mucuous membranes.
I'd already used it a couple of times and thought I had the timing and amount worked out, so it was a painful surprise. Be careful using those things.