As someone who was addicted to heroin for almost a decade, with repeated failed attempts at stopping, I will agree with some of the posters above. It's not worth it man. Look at the opioid crisis in the United States right now. I can't even count how many close friends and former high school class mates died, or ended up homeless or in prison after making the mistake to try out a low dose of heroin. It escalates quickly, and that stuff changes you at your core before you realize it.
But i digress, because you're going to do whatever you want regardless of the opinion of strangers online. Again, as was stated before start as small as possible. If you're snorting it, starting small, feeling it out for 20-30 minute, then redosing when necessary isn't going to affect the overall experience. The purity from bag to bag can range dramatically. I've seen friends with crazy high tolerances die off 1/10th of their normal dose. Better safe than sorry. Never use 3 or more days in a row, that tends to be a typical point of no return.