I LOVE upholstery! Getting to the fun part, choosing the fabric, deciding the color, pattern and material, so many fun choices I always have a hard time choosing! But the not so fun part comes first, removing the old fabric and padding. There are often TONS of staples and hot glue. You don't have to remove all the staples always but you should remove most of them.
You can get all the supplies you need at your local fabric/ craft store.
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