I will have someone with me and by tiny do you mean like a pinky nail or less? Sorry if this is a difficult question. And thank you for caring
Well it's a bit tricky to answer. Thing is heroin purity can vary a lot from place to place. Where I live is probably one of the areas where heroin is on the purer side than most. And how pure it is will of course change how much you need to get a good result and how much is dangerous.
Also all my experience is with people who had at least some opioid tolerance to begin with.
I've seen quantities of heroin that look to be not much bigger than a few mg give a decent result in people with little to no tolerance. It was some time ago now but I remember when I started I needed what seemed like nothing compared to today.
Also as the above poster mentioned, most people wind up experiencing pretty bad nausea when they first try opioids. It doesn't seem to be universal, I've never found myself especially prone to opioid induced nausea, but it's certainly very common. So that's another reason you may wanna try starting pretty much with as little as possible and working up.
It may well be that the heroin you're likely to get won't be as strong as the stuff here, in which case you may end up finding the level of caution I'm recommending seems a bit overstated, but still better safe than sorry.
Id suggest taking a few mg and snorting or smoking it (which way works better depends on what kinda heroin you're getting. Heroin hydrochloride would probably work better snorted). As a size this is probably only a millimeter or so cubed (bout 1/16 of an inch). I'm not sure, and the heroin we get here is compressed, not powder, so that might be off.
You'd probably be fine with a significantly larger amount than that, but you may well not need more than that to get a good result anyway. It's a pretty wide distance between good result and dead.
And more over cautious is better than under cautious. You can always use more if it's not enough. If you are able to smoke it the effect should come on almost immediately. With snorting it'll take a bit longer.