I also cut my fabric the WOF and use two or three strips depending on the size of my quilt. Then I lay the border down the middle from top to bottom and cut it off that length. I then start pinning along the side and if the quilt is a tad bigger than the lenght of the border I ease it in by pinning it. Once the sides are on and pressed I measure the quilt from the middle side to side. Then I pin it on the top and bottom . My borders are never wavy and I do this with every border that I add on.