Whether you learn to Knot from an instruction book or take a knotting class (that's what I did), you will be told the same thing - you must have a pair of knotting tweezers. How are they different from other tweezers, you ask well, they come to a very fine point, so that they may be slid out of an already-tightening Knot once it has been maneuvered into place. The bent or angled tip is preferred by some because it offers a bit more flexibility in how you hold your fingers while knotting.