I don't know WHY people here say oxy IV is a waste. Some of the best and most intense rushed I've had were from oxy. First of all make sure you know what dose to take based on the pill strengths and tolerance. You will hear people say not to shoot pills, and if you do, use a micron filter. I'm sure this would be better for you, and I am not advocating anything else, but I personally have shot oxy and dilaudids many many times - thousands of pills - and never had any issues. Don't do it excessively and you should be just fine if you use cotton and make sure there are no particles in there.
Anyway, get your dose, place it on a spoon. Grab a bic lighter and crush it against the spoon with the bottom of the lighter, making sure pieces of it don't go flying across the room as this is very easy to do. Once you have a fairly fine powder, suck up 30-40 mL of clean water with your rig, and sprinkle it on there evenly. Again, people will tell you not to heat it. I always did, but I do know with oxycontin in particular, the wax they have is very bad to shoot. Yours sound like IR so it should be ok. Make your ball of cotton, put it in the mix, suck it all up, tap out your bubbles, push till there's no air left within, find your vein and go nuts.
Again, I would feel AMAZING shooting even 20 mg oxy with a tolerance, so I really, really don't know why people say it isn't worth it. It's an opiate rush like any other. It may not be quite the same as a bag of good H or a decent amount of dilaudid with no tolerance, but I'd buy em all the time and use em even when other stuff was around.