Lol, it's not too difficult. Just get a dime bag and a pipe, walk off into the woods alone, and give it a go. It might be better to first try it alone so you're not worried about what other people are thinking.

All you literally do is breathe normally, only with your mouth around that pipe. Your lungs might start to fill up a little and burn, then when you can't hold no more, exhale, sit back, and prepare to be ripped.

Good luck.