Becasue it's fiddly work, and the era matters, I tie the robands --which fore resons of scale might be a clove hitch of thread--arounf the yard, and fiddle with the spacing until I'm happy. If I'm concerned about it, I'll snip out a gauge from paper card stock to unify the spacing.
With the yard ready, bring the sail material up as near as can, then transfer the band locations to pre-punch the sail.
For 1800s era, the clove hitch is knotted at the top of the yard, spritsail topmast era, center of the front of the yard; erailer than that, underneath.
Then, I work from center of the yard outboard. Bringing one tail of the clove hitch up through the sail, and bending it off using the other tail. Teeny dab of glue once everything is knotted up tight. Then trim the bits when the glue dries. (new, sharp, cuticle nippers can be your friend here.)
Interestingly, the high -on-the-yard fixing of the sail has aerodynamic benefits. The yard acts as a sort of leading edge slat, helping keep the air spilling over the yard more laminar to the sail.
Note, too, that the cut (and the billow) of sails varied between eras, and between navies. Additionally, mast position matters for sail cut, too. The topsail often needs more "arch" in its foot so as to clear the forestay(s).
Far too many vacuform sails are as fanciful as Heller rigging diagrams. . .