Thrift stores are so hit and miss. Most are overpriced, but I still have the hardest time driving by without stopping. Every once in a while I find an amazing deal, or just the piece I was looking for and it makes all of those extra trips inside worth it.
Once all the fabric was stapled on I used sharp scissors to cut the excess away, making sure to cut as close to the staples as possible.
For the trim I used 3/16″ cable cord and 2.5″ strips of fabric to make double welting. Vidya at What’s Ur Home Story has a great tutorial explaining how to did it. Then I just used glue to attach the trim onto the edges of the fabric to cover up the staples and ugly edges.