I would take half of the pill (40mg) orally, and then go from there. If it gets you going good, then right on! But if not, you might move on to chewing up the other 40mg real good, parachuting, or snorting the powder.
For anectodal purposes, I snorted 60mg of oxy with zero tolerance and was completely numb, spaced and nodding out in my chair. After smoking I was conscious and breathing fine, but mentally almost unresponsive. It was one of the greatest highs of my life, and that is exactly why I don't recommend it. I could have passed out, started vomiting, etc.
But hey, take all your info and now judge the risk for yourself. The greatest ability is making your own decision as long as you've got proper info.