1) Call 911.
2) Reach down the victim's throat to see if anything is there that you can get out.
3) Push on the center of the victim's chest at a rate of about 100 pumps per second. This will push air out of the victim's lungs and hopefully dislodge the item in their throat. Pump 30 times.
4) Lift the victim's chin and pinch their nose then blow. If you can find a piece of cloth to put around the victim's mouth. Each breath should take one second. Only blow TWICE then repeat.
Note: You should have someone help you, this process is very tiring.