Use a large pot, 6-8 quarts, 4 quarts of water for one pound of spaghetti to give it plenty of room and water to move around in. Use tongs to immerse the pasta into the water and twist it around to fully immerse it in the water.  Let the water come back up to a full boil, and stir the spaghetti so it doesn’t clump or stick to the bottom of the pan. If the spaghetti sticks together after it's drained, toss it in a little pasta water.