I leave a little extra and only fuse what I need. If the piece is large, I cut the center out and just fuse around the edge, then trim it back to the line. I prefer this way most of the time.
I use the steam a seam tape when I have straight lines. This is how I put my quilt labels on. Then I blanket stitch the edges...when I remember to do it prior to quilting that section. ;)