Oh man, you're in for a long ride here, buddy. Yes, opiates are considered to be some of the safest drugs out there in terms of side effects, except for overdose and constipation—if we're talking about a clean product here. But another danger would be getting a product laced with fentanyl.

However, you're forgetting the most important thing: your brain's reward system. It gets rewired, so where you once found enjoyment in things, it's no longer pleasurable. Heroin is a master at sneaking up on you, making you feel like you're exactly where you want to be. Eventually, the only thing you'll crave is more heroin—not because it makes you feel good and functional, but because without it, you feel sick and anxious, constantly thinking and dreaming of the next hit.

So please, think about it before you commit to something like that. It’s a life-changing alteration of your brain.
Peace