I don't know where I picked this tip up, but I'd like to thank that person. Tonight I tied my warp onto the front apron rod of the loom, and I remembered the tip I had heard to swap the edge threads in the sections when I'm tying on. Like so: Why? When you go to weave the header, look how quickly the warp arranges itself into place!! Header woven, ready to go. And very little waste of warp. I love this trick.