It depends on doctor, locality, etc. Where I live, you have to jump through hoops, get drug tested frequently, sign contracts, etc. I’ve been treated like a human being, and I’ve been treated like a subhuman junkie. Usually, pain docs don’t do that, but you get the rare bad egg. (ER/A&E is the worst. If you have to go there for pain, pray there’s a knife at the source of it.)
Depending on pain type and severity, as well as doctor, you’ll probably be given non-opioids first. If you get opioids at all, expect to get just enough to take the edge off. Honestly, there are some great non-opioid meds out there. I used to take pregabalin (Lyrica), and it does a damned good job, but it does make you kinda loopy. Duloxetine (Cymbalta) eases pain for some people. Acetaminophen/paracetamol is about the best drug for bone pain. Don’t underestimate NSAID’s, especially prescription only ones, like Toradol and Mobic. (Go easy on Mobic, if you get it. It’s nephrotoxic, and makes some people feel really sick. Great pain med, though.)
Basically, be honest, don’t eat anything with poppy seeds for a few days prior to the app, and be proactive in saying you’re happy to try non-narcotic meds first. That’ll go further that anything in creating a good professional relationship.
Drink a bunch of water an hour ahead of the appointment. You WILL have to pee in a cup. You WILL be squirming by the time you get there, and you WILL want to wash your hands.
I mostly hate my appointments because they take forever, btw. Expect to be called back late, so take a book or something.
Take notes, speak up for yourself, and be as compliant with treatment as possible. That said, if a medication doesn’t work for you, call the office as soon as possible. I had to stop taking a drug that made me actively suicidal. (Ironically, it was an antidepressant.)
Good luck! 
