Summarize:

You will need a clipper, a comb that attaches to the clipper, a brush and some lubricant. Buy a clipper designed for dogs at a pet shop or an animal grooming store.  If you know that your dog is often startled by loud noises, test the various clippers available to see how loud they are. Pick one that won’t make much noise.  Purchase an E comb. This comb is designed to leave an inch of hair left, which is the length typically recommended. It is easy for a clipper to overheat, burning your dog. Take frequent breaks to cool down the raiser. Apply the lubricant that comes with the clippers to prevent the device from overheating. If there are clumps in its hair, it will be hard to pull the clippers through.  This could be painful for your dog and difficult for you. Wash and brush your dog to get these tangles out of its hair and get it ready for the shaving. You want to prevent your dog from moving too much while you shave it. If your dog is at all resistant, you should probably have a second person around to help secure it in place. If you shave against the growth of the hair you can create harsh lines. Use slow, gentle strokes. If you are having trouble figuring out what direction to shave, take a credit card and rub it along the hair. If you begin picking up the hair and pulling it backwards, you are pushing against the grain of the hair. You will want to shave in the opposite direction. As time progresses your dog might get more impatient. Begin with the hard to get spots and then move on to the easier areas.  A good order is: head, underarms, under-tail, behind the head, back, sides, belly. Unless your dog is completely still you should skip its face altogether. Even then, stay at least an inch from the eye while shaving. When the dog is standing, lift up its arm in a comfortable position. Shave under the arm and repeat with the other arm. Lift your dog's leg as if it were going to go to the bathroom. Shave underneath the leg. This will keep the dog clean when it needs to go to the bathroom, especially for long haired dogs. Repeat with the other leg. Raise its tail and shave around the bottom. This is also to keep it clean when it goes to the bathroom. Be careful here too. Start behind the head and go down the neck to the back and then down both sides. Shave the belly carefully and remember to shave away from your hand.
Purchase equipment. Keep the clippers cool. Clean your dog’s hair. Restrain your dog by its collar. Shave with the growth of the hair. Start with the sensitive areas. Shave the underarms. Shave the groin. Shave the bottom. Shave the rest of the body.