if you really want to look for the ultimate bliss, and don't want to have to experiment, you will look into IV administration.
Don't bother with smoking and snorting. It's only going to create a tolerance for the effects. The first time i did H, i shot it, and holly shit, haven't touched it since. I am now shooting Hydromorphone when i want the zing.
One properly placed shot is all it takes (to get you 6 feet under) to get the feeling you are longing for (the two are closely related, the golden nod and the overdose are only separated by a hairs breath). Then, you may as well quit after you have experienced this, because it will never feel this good again. Ever.
IMHO, go buy some syringe filters, a clean rig, and the works needed to perform a safe injection. I suggest to use pharmaceutical opiates such as Hyrdromorphone or Oxymorphone, because your dosage is well known. With a bag of heroin, i would always do the first tester shot to assay potency. I didn't do that my first time ever injecting Heroin, and i got extremely lucky that i was with an experienced user who knew how strong the shit was. He eyeballed a 1/4th of a bag for me, and i slammed it. All this time plugging, snorting and smoking opiates, this was what i was looking for all along holly shit.
The needle filled with heroin literally put the fear of god into me, and i became weary of injecting. now, i shoot up 2 - 3 times a week at my leisure, and still have a good time. But the feeling i am looking for is gone. I don't get it back, no matter how much i shoot. I just get higher and higher.
Ever tried going into withdrawals for two days and then rigging up a perfect shot? It's close to that first time feeling, but it sinks in that you actually only just feel "normal" again.
Be careful.