1. You need a log base, which is easy to find in the woods. However, not just any log will do, because you want one where you've seen squirrels or other animals. You might find animal tracks leading to the log or find a game trail close by. Make sure you're placing it where animals move or it's a waste of your time to place the snare.
2. You'll also need a limb to hold your snare open and up, but if a limb is not on the log itself, you may have to cut one and place it beside the log. It's a good idea to place a number of snares on one log, say a half dozen or so. Don't worry if you need to place a number of limbs in position around the log.
3. A wire, rope, or vine snare to catch the animal by the neck. Wire works the best, but use what you have. Now, if the snare closes, it's very likely it will not kill the animal, so you'll have to do that job. While many of you may not like that idea, it must be done if you are to survive. You can kill the animal with a rock, club from a large limb, or your spear.
Warning: Never pick up an animal that is not dead. Even squirrels have sharp teeth and long nails that can cause serious injury.Make sure any animal is dead before you remove it from the snare. Often people will pick up a stunned animal, only to have it come to life suddenly as they are handling it.