First off, as others as said, maybe consider it a sign to not start IVing your drugs. Once you do get the hang of it, you'll find it very hard to ever go back to any other ROA and fucking impossible not to think about it the times necessity forces you to. Hell, it's impossible not to crave that pleasure any time besides the one to three hours after you push off. Not to mention the physical health risks. Making the jump to intravenous should be a decision that's extremely well thought out, weighing ALL the risks involved, physically, psychologically, and social, against the two pros, more efficient dosing and that rush.
That being said, your OP is, almost word for word, me when I started. About thinking I'm gonna get it this time, but nothing, and when I pull out there's the dark vein blood, sometimes even a drop or two making it into the barrel. See, my pipes are all DEEP, and I could almost never rely solely on my eyes. Even after tying off and bringing them up to the surface, I could only barely feel the slight bulge through the skin. However, that was the first step towards
success. Really pay attention to how the vein your aiming for curves and where exactly it is. This will help you judge the angle better. Go in at around a 45 degree angle, once you've punctured the skin lower slowly to a maybe 10-25 degree angle, maintaining the needles position along the vein. From here, go slowly and calmly, I can't stress slowly. Once in, while lowering the angle, draw up slightly on the plunger. This will produce a small bubble in the barrel, and pressurize it, so once you are in a plume of blood will shoot up into the barrel. This is KEY to determining when you are in. The next thing I'm about to tell you was the single most helpful piece of advice I got. The whole time the needle is in the skin, stare at that point, right where the needle is, using your peripheral vision to look at the barrel for the flash of red. Once you see the blood start to rush into the barrel, REMEMBER THAT EXACT POINT, the angle of the needle, how deep in it was, what direction it was pointing, EVERYTHING. Use a point of reference on your arm, a hair, freckle, etc. This technique will help you stay in, and get BACK in should you accidentally fall out of or poke through the vein. Once you're sure it's in, slowly push down the plunger, eyes still on the point, re-registering halfway through or if you start to feel a burn under and around the injection site or a small bubble rising next to it, as this means you're missing.
Patience is the key here, I used to get very frustrated and that only made it worse. Practice makes perfect, even with horribly dangerous hobbies. I have to reiterate that it is definitely in your best interest to reconsider whether or not IV is for you, but I certainly know how I would have(and indeed, did) react to someone telling me that when I first started, hence the hopefully helpful tips.
A few other things that have already been said/don't fit in anywhere else: definitely change your rig. What you have now I would have killed for last week when all that was around was Roxis, and I was stuck with my normal gear (and REALLY never shoot pills, especially oxy as it's already highly bioavailable orally, which is the route I went and usually do go except for a few stretched apart occasions), but for dope you want a 1cc rig. I use 28 gauge 1 cc 1/2" inch tip and out of all the sizes I've tried, this is my favorite. Just go into the pharmacy and ask for exactly what I just said, bag of 10. Also I notice you said you're tired of wasting your cooked shots, but depending on where you live/which kind of heroin you have, but since you said you insuffulated it, I'm guessing east coast powder dope(#3 I think? Or was it 4..?), you don't need to cook. It's readily soluble and the sanitation factor is negligible. But that's really preference. I hope I helped, if your mind is made up to be an IV drug user, then you MUST get proper technique down.
DON'T SHOOT DRUGS!
