Wow sometimes I forget about the tourniquet thing... I've actually never tied off before, and I've been injecting daily for almost a year.
It's ironic, because my veins are really hard to find and tying off is supposed to make them pop to the surface... But since it never worked (I did try a few times) I just gave up on that step and have learned to find my veins mostly through touch (you can feel them under your arm).
The veins on top of my hands are a different story, those are real easy to see so i rotate between my arms and hands.
But as others have said, sometimes the veins are easier to find than others. It's probably the same for most people, but first thing in the morning they are REALLY good at hiding, like they've retreated during the night. So I worked up a routine that brings them much closer to the surface:
- a few squat thrusts to get the blood flowing all over my body (10, usually)
- run warm water over my arm where i plan to inject (we all have our "easiest" spot to find a vein, and so that's the one I run water over in the morning). I do this for a good 2-3 mins and i think it's the most important part of the routine.
- I take a full 2 liter bottle of water and do 20 curls with it. It's heavy enough that after 20 or 30 reps you'll feel it and besides the goal here isn't to build muscle, but to get the blood flowing and the arm warmed up and this does the trick.
After all this (takes about 5 mins) the vein is much easier to hit, and i'm probably one of the toughest cases out there, since I can never actually SEE the vein - i go by sense of touch, experience in knowing where the vein usually is and, of course, the still-healing track marks that tell me "X marks the spot!"
Seriously, would any of us be able to find our viens if we didn't have that little road map up our arm??