Your bikini area and armpits are extremely sensitive, and the skin must be held very taut when pulling. It is essential that you follow the step by step instructions. All you need is a little experience. You will find with experience you can cover larger areas at one time and be able to use the same strip twice without having to spread Nad's on the skin again. Approximate time for legs is 20 to 30 minutes.
Smaller areas take less time than that.
Because of the natural substance in Nad's, there is little chance of irritation. Redness for a short time is normal, depending on how sensitive your skin is. The redness should disappear within a half hour. Use a loofah in the bath or shower to help remove dead skin, and to help the hair to penatrate the outer surface. I'm scared to pull the strip off swiftly.