Heated hard wax is recommended for the bikini area because the hair is so coarse there. Hard wax goes on smoothly, and you can pull it right off with your hands once it hardens. If you're new to waxing, you may want to buy a hard wax kit. It will come with everything you need and include detailed instructions.  Avoid soft wax and soft wax kits. Soft wax works best on fine hair.  Avoid cold wax strips as well. This wax can be painful when used on the bikini area. Hard wax must be heated before it can be used. Each product will be different, so check yours for specific instructions for heating. You can use a microwave to melt the wax. If you plan on waxing in the future, consider investing in a wax warmer. A warmer keeps the wax at the right temperature as you work and you can bring it into the bathroom with you. Warm the wax to be the consistency recommended by the product instructions. The right consistency is similar to warm syrup or honey – pourable, but still thick. Give the warmed wax a good stir with an applicator stick until you're happy with the consistency. Then dip the applicator into the wax and apply the wax to your forearm to test the temperature. It should be comfortably warm, but not hot. Let it cool down a little if the wax stings the skin on your forearm. Don't try to wax in the living room or a shared space of your house. Go somewhere you can be completely alone and comfortable. Wait until everyone is gone so there is no chance of someone walking in on you. You want to be able to take your time and feel relaxed while you work.  You can wax on your bed or on your floor (with a towel laid down) so you are comfortable. Have a mirror in front of you so you can see what you are doing.

How would you rephrase that briefly using Vietnamese?
Sử dụng sáp cứng hoặc mua một bộ dụng cụ tẩy lông. Làm nóng sáp bằng lò vi sóng hoặc máy hâm sáp. Khuấy sáp đã được làm ấm và kiểm tra nhiệt độ của sáp trên cánh tay. Tìm một nơi thoải mái để thoa sáp.