Ok, so this hardly warrants a tutorial but I thought some of you might find it useful. If this is a widely used technique and I am just really behind the times then, sorry. Well here is my little tip.
Have a piece of regular old scotch tape cut and ready! Figure out where you want to place your elastic and pinch the middle so that the two pieces are touching and just place the tape over the elastic and the fabric. That's it, so easy but so useful!
Then just sew whatever you are making!! Then when I flipped my list taker at the end, I just peeled the exposed tape away from the seam. It gets perforated when you sew through it and tears away really easily!