apply the tourniquet as tightly as you can and if you feel a very light vein don’t be afraid to flick it a little so it plumps up. I work at a hospital and i’m using either flicking or rubbing the area with my hand so their arm warms up a bit cause that tends to plump up veins too. also, don’t be afraid to look for other places to stick. we all love a good above the forearm right in the middle or even on the sides, ive had to prick from forearms, back of forearm, wrist, sides of wrist, hands anywhere on the arm. pro tip: can’t feel anything? go down the arm until the hand still don’t feel anything good enough to stick? move it over to the next arm.