I use the method that tall-chick posted for borders and add a few extra steps in my process.
First, I square up the quilt and stay stitch around it using a 2.0 stitch length. Borders are cut and stay-stitched then given another press. Stay-stitching helps prevent stretching on those long pieces. I mark match-up points on both pieces (about 10-12 inches apart). Match up the quilt/borders and pin together.
This method may take another 15-30 minutes but this gives me the best results on quilts/borders. Good luck!