Does Nair burn/hurt?

Sooo one of my friends told me I should try Nair as an option for removing hair from my legs other than shaving. We were complaining about how long it takes to shave and that's when she told me she switched to Nair for her legs and armpits and the only thing she shaves now is down south. I happened to mention it to my mom and she said that it would burn and I should stick to just shaving. I do have sensitive skin so that's the only thing that worries me. What are you alls experiences with Nair if you have used it? Also doyou have tricks or tips on how to shave faster?