<human>:  How do I sew a hem?
<bot>: To sew a hem, you will need a needle and thread, and a fabric piece or garment you are hemming. Start by pressing the area to be hemmed with an iron. Fold the hem up so that the raw edge is hidden, and pin it in place. Then, stitch the hem in place by hand or by machine. To finish, press the hem with an iron.