So the process for prepping the strings...
You cut them wider than you need them because of stretch. I usually cut them 1.5 x the final width on the outside of the hide (which is stretchier) and 1.3 as I get to the inside. Then I stretch them by wrapping them around something a few times and pulling while holding onto the other end to create the tension needed. I stretch each strand twice this way. Then you cut the strands down to their final length, then pair them*, and then grease them up with the plaiting soap.
So I completed one strand with this process (the double length one) and then moved to the next one and....forgot to stretch it. I got halfway through cutting it to size before it struck me. In retrospect it should have struck me much sooner. I mean I thought to myself, "Wow, this one's a lot wider than the last one," as I started cutting, and yet...
So that strand is wrecked for the overlay. So it will become extra that I'll use for the knots and/or the handle strap later and I'll cut out another strand for the overlay.
*pairing is tapering the edges so the strands lie flatter crisscrossed against each other.