I did it many years ago for my daughter's room. I used staples. If I remember correctly I turend inder the fabric at the top, then lifted it up put a slim piece of poster boared and stapled as closr to the top as possible, let the fabric hang down and smooth and turn under at the bottom and staple. Sometimes you can put staples in where they will not show or you can cover with trim. T =he next piece of fabric lays over the first piece, wrong sides together as if you are sewing them together and staple on the seam line, then open out the fabric. You may need some thin poster board in this seam to keep it straight. I hope this is not to confusing.