I agree with everyone above who says you are better off just sticking with Oxy, the problem is though an opiate habit is an opiate habit, you stay on Oxy long enough and you'll have a habit, then one day you'll be WDing like a motherfucker and you'll be broke and then you'll run into H....
So stick with the oxy and then quit the oxy and don't look back. Any opiate habit will rule you, I used to sit waiting at the window for the mail man to bring my poppy pods like a dog waiting for it's owner to come home.... and on the days when I was in withdrawal and out and he didn't have my package... oh how my life shattered...
But you want to try it, so here's my advice/story.... I've been in your shoes! Literally, what size are you wearing?..jk. It was almost a year ago when I tried it the "first" time (first usually leads to second, to third.... habit!) and oh the lessons I have learned....
Well, I can't knock you for wanting to try it, I wanted to try it forever and always told myself I wouldn't. Then, 2 or so years into an opiate addiction including Oxy, Vicodin, Morphine, but mostly straight up Poppy Pods or Suboxone I ran out of EVERYTHING.....WD city or?
"Sorry dude, everything's dry right now, but I can get some brown.... in a half hour...." I couldn't find anything else and I didn't want to try H but my WD's told me otherwise, I tried it and it felt just like any other opiate except it hit faster. I smoked it by the way. At the time I kept buying H since nothing else was available and it's damn hard to taper off of H.
I don't think I really loved H until I was in withdrawals from H and waiting for hours for this dealer, the relief when I finally got it was amazing. The first time wasn't amazing at all though, I just thought to myself "why does everyone make such a big deal about this stuff?"
It's main appeal is it's unique high combined with it's rush and availability and low price if you're not getting ripped off.
MY ADVICE
DON'T TRY IT!!!
It's a constant struggle to stay away from it, it's too easy to get once you know people who use it, your tolerance can skyrocket if you keep increasing your dosage and then your life becomes nothing but finding the next fix. It sucks you in quick too but you don't even realize it.
however, you'll do what you'll do, just as I and many others have. I'd recommend smoking it if you get tar, you can easily gauge how much you're getting at once, you'll need someone to show you how to do it. it's a bit tricky but unfortunately it's all too easy to get the hang of and you'll never look at tinfoil and bic pens and lighters in the same way once you get used to it.
Life has so much more to offer than H, I'd really recommend against it, it's a life of extremes, love hate, suicidal euphoric, watch a friend turn blue from shooting up too much and maybe it'll change your outlook. And if you get a habit, which is more than likely, just forget about having money ever again until you're clean.
I'm on subs now, a low dose, I realize how much better life is without H yet I can't have any amount of money in my hand without thinking "hmmm, just a phone call and a ten minute drive and I'll be in heaven...." It can be hard to resist once you know it's high, especially if things go bad in your life, and believe me, things will go bad in your life more often the more you use H.
That's my rant, I don't think it's the worst drug in the world by any stretch of the imagination, it's just it's illegal status and the people you have to deal with to get it, the way it turns otherwise honest people into lying manipulating junkies who you can never trust again until they're clean..... It's much better just to have a girlfriend and go watch a movie have sex then sleep and go to work the next day than live an H life, it's all or nothing once you're in it. Yes, a "normal" life is much much better, people wait in line for their methadone everyday so they can get back to "normal"...if it were legal and controlled I'd say go for it, get it out of your system, but it isn't.
Whatever you do, be safe, don't use it alone, don't inject it.