I used it once...
Once.
It was an experiment, I swear.
Also, it was a terrible experience. My advice about Nair, put it in the trash now. Okay, I might be a little harsh on the product, but it was a biatch to me. I didn't use the roll on. It started off like this. I put it on my arm pits, (what I originally was just going to do it for) and then waited, the instructions on the bottle say whatever minutes, but then I got some on my chest too, and that smeared it, so I was like, screw it, and put it all over my chest and decided to nair that, and then since I was already there... I decided to Nair... yeah.
So I waited.
Then I started rubbing, half the hair came off, half stayed on. The ones that stayed on were weak so I just had to pull them a bit and they came off. Since not all of it came off, I reapplyed one more time. That time was a mistake. It burned like a motherfucker. ALL OVER... including... yeah.
Um. Don't use nair.
About the breakouts, it happens to some people, doesn't happen to others. Try a small area first and see if you break out, if you don't, you're set. But you shouldn't have to shave body hair. General concensus say that girls don't mind typical body hair. Except for back hair, they hate that. Just be careful with that stuff, it smells like crap.