Article in English: Make sure the shower (or bath) is warm to open pores, which will give you a closer shave. Avoid using hot water, which can dry out your skin and increase risks of razor burn. Take your usual shower, or bath, to allow the leg hair to soften. You want to give your legs a solid 5 minutes or so taking in the hydration. So go about your routine, shampooing, conditioning, and hit your legs last. And if your shower doesn't have a nice ledge to prop your foot on, hop out of the shower and start shaving while your legs are still wet.

Summary in Vietnamese:
Chuẩn bị nước.