I was told that it starts with warp.
As the hours passed I realized I had no idea this much work was involved. I kept asking "when do I weave?"
At the front apron, each small group is secured (starting at the center group and working to the sides) with a half-square knot (the center group is secured with half of a surgeon's knot). After all groups have been secured, they are tensioned and secured by loosening the knot and pulling on the ends and tying the full square knot.
The shafts are engaged one-by-one and the shed is checked for stray yarns (mistakes!) which are corrected. Everything is checked again, because there's no point in proceeding unless everything is in order.
As 24x7 said, warping accounts for at least half of the weaving. Makes sense, doesn't it, when we see that at least half of the threads in a piece are the warp?