Epilating heavy androgen-driven facial hair is very hard on the skin, and should be done slowly over a long period of time. I do not recommend plucking this type of facial hair if there's a lot of it, but if you must, try to do small amounts over a week or two, and avoid stripping an area. Instead, pluck in a scattered pattern that's spread out, and then go back over the area after it's healed. this is a bit easier on the skin.