Karen, I trimmed all my tri's and my kites before doing any sewing together. I DID pretty much drench them with Best Press and pressed them prior to trimming, but then just sewed the tri border together....then attached a kite to each end (right and left) on the top and bottom borders. I attached the L and R tri borders to the quilt first, then I added the T and B....just like you do with regular borders.