Summarize:

Bikini-area hair tends to be a little coarser than other body hair, so it might be difficult to take it off with the type of razor that comes 10 to a pack. Instead, pick out a high-quality razor designed for use on sensitive skin. Use a razor with new, sharp blades, since using a dull razor can cause chafing and ingrown hairs.  A men's razor is better to shave your bikini area. They are usually sturdier and have more than one blade, unlike women's razors. They remove hair easily while taking good care of sensitive skin. (You can usually distinguish the two types by color. Men's razors are usually white. Women's razors are usually pink or pastel-colored.) Avoid using a razor that has just one blade, unless it is a very sharp safety razor. Razors with just one blade have a tough time removing hair in the bikini area. Look for one with three or four blades so you will get a closer cut. A brand-new razor that has never been used before will be sharper than a used one. If you have to use a lower quality disposable razor, using a brand new one every time you shave the bikini line will yield best results. You can always use the used razor for armpits and legs. The type of cream or soap you use does not really matter, as long as you use something. Pick your preference: body wash, shaving cream, or even hair conditioner all work equally well. Soaps and creams that contain fragrances can sometimes be irritating to sensitive skin.  Test the product on another, less sensitive part of your body before you use it in your bikini area. Take a look at yourself in the mirror and determine where you want the cutoff to be. The bikini line is a little different on every woman, but in most cases you will remove any hair that would be exposed if you were wearing bikini bottoms. That includes hair on your upper thighs, around the groin and below the belly button.  For a simple shaving guideline, bring a pair of your underwear into the shower. Wear them while shaving. Anything peeking up below the seams should be removed. (Note: this will work best if your underwear has similar lines to your swimsuit bottom.) If you want to take off even more hair, see  How to Shave Your Pubic Hair. You might also consider  How to Give Yourself a Brazilian Wax if you want to go totally bare. If your hair is too long when you shave it, it will get tangled in the razor and could become a big mess. Prep your hair by using a pair of hair scissors to trim it back to about 1⁄4 inch (0.6 cm) or shorter. This will make it so much easier to get a close shave.  Gently pull the hair up and away from your body with one hand, then use the scissors to carefully trim it off with the other. Be very careful not to poke or cut yourself. Trim  your hair in a well-lit area before you get in the shower. This will soften your skin and hair, making it easier to shave it all away. Save shaving for the end of your shower or bath, after you've already shampooed your hair and done everything else you need to do.  If you are not shaving in the shower, you should still prep the area by moistening it with a hot washcloth. Skipping this step could result in razor burn and a lot of discomfort. If you have time, exfoliate the skin in the area as well. This prevents the occurrence of ingrown hairs after shaving.
Use a sharp razor. Choose soap or shaving cream. Decide how much hair to remove. Trim the hair to 1⁄4 inch (0.6 cm). Take a nice hot shower or bath.