How to cut a weft?
Never cut hand tied from the top, it is very common mistake made even by the most experienced hair stylists. If it is cut, then you should seal it with good glue like nail glue or fabric glue. It is not guarantee that it will not shed. Never sew through the top of the weft, you should sew around the weft. You can cut the machine weft where desired. Most weft shed because it is not cut properly.