
well, they put a tourniquet on the upper arm first so that the veins are more prominent, and then put the needle in to draw the actual blood. i don’t have issues with needles so idk about advice on that end (i do get really squeamish about the tourniquet though funnily enough) but my strategy is always to just focus on keeping my arm totally relaxed from the shoulder down and to look away from what’s actually going on
More water = higher blood volume, the veins stand out more and makes it faster and easier. Will help you feel less faint after, too! Seconding the eat beforehand. If you know your blood sugar drops easily, eat something sweet within the hour before, as long as it’s not a test that requires fasting