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You can probably hem most dresses on your own as long as the dress is a simple design with fabric that is easy to work with. However, some dresses may be difficult to hem on your own. Dresses that are made from delicate fabrics, include beaded embellishments, flare out significantly, or have multiple layers may be difficult to hem. For dresses that pose these kinds of challenges, consider hiring a seamstress. You may also consider using a rolled hem for delicate fabrics or flared skirts. If you are using an existing dress, then you do not have to worry about putting the dress on. However, if you want to ensure that the dress is going to end at a certain place on your body, then you will need to put it on and measure it. Getting the measurements just right for shortening your dress will be easier if you have someone to help you, so ask a friend to help you. it. To ensure that your hem will be flat and straight, you may want to flatten it with an iron. To iron your hem, pin it in place, and then remove a few pins at a time to iron the hem in sections. Replace the pins after you finish ironing each section. Keep going until you have ironed all the way around your hem, and then sew your hem.