Start from below the neck and start shaving in the direction of hair growth.
If you work a high profile marketing job—or heck, even if you work waiting tables—keep things secured under your shirt.
Chest or breasts: If you are a man with thick dark curly chest hair, re-growth will most likely occur here.
If you think that you will get confused about which razor is which, you can always use disposable razors to be on the safe side.
Or you can cut it by shaving your chest hair or trimming it.
Some work well in water shower others not so much.