I also use the school glue exclusively. I bought a small bottle with a tiny tip that can be rinsed out and cleaned for future applications. I got it at the Wi Quilt Extravaganza last year and it's the BEST!
The gal said to glue, press to set, and sew. If you need to re-position anything, just pull it apart, re-glue, press and sew. I love Elmer's school glue.