I’ve pretty much perfected it.
First needle closest to clavicle. Wire. Next needle cranial. Wire. Load both dilators, sheath close to clavicle. Insert sheath, pull wire. Dilate/insert dub lumen, pull wire.
More bulky sheath ends up laying on top of double. It’s more comfortable for patient, easier to secure, and easier to remove first.
I had an old attending when I was first in the OR. Loooiong before ultrasound. Would grasp two pig stickers, 1-2cm apart, landmark, hit IJ, and off he goes. Was remarkable.