Just did this on the last quilt I made. I cut the sides from the length of fabric; top/bottom from WOF. Granted this was a baby quilt - although on the large side for that but the same principles should apply for larger quilts as well. I generally also only cut one border at a time. Put the first cut piece next to the correct/corresponding side/end then cut the next and so on. And each time I work with a directional fabric I ask myself 'why did I pick THIS fabric for this?'.
Hope this helps. Good luck.