Shaving removes dead skin cells and the superficial layer of your skin. While this process is actually healthy for your skin, it also reduces your skin's defenses for a couple of hours. If you do shave in the morning, you are more likely to expose weakened skin to external elements and your shaved skin will feel less comfortable. Shaving at night will give your skin the entire night to recover its strength and suppleness to resist irritation.
Try not to shave any part of your body without having your skin perfectly clean. This will help prevent infection or bumps. Apply hot water or shave after showering. Warm humidity increases skin elasticity and softens your hair. Hot water actually diminishes hair toughness, which can increase blade longevity and wet hair is easier to shave.
Once your hair is softened, the razor will glide more easily over your skin, avoiding damage. Shaving cream / gel with Aloe Vera is preferred to normal soap as it will be gentler on your skin and lift your hair. Lather the cream / gel with back and forth motions over the area you are going to shave. Leave the cream / gel on your skin two minutes before shaving.
Keep in mind that the duller the blade, the more irritated your skin will become. Change your blades regularly, especially if you have sensitive skin. On sensitive areas, such as bikini and underarms, shaving with a dull blade can result in red spots.
After shaving, the skin is both dry and irritated. Apply an alcohol-free after-shave to re-moisturize your skin and avoid the feeling of razor burn.