Assassin creed

Hey readers  have you ever heard of a game called Assassins creed. I played it this week end 3/2928/09 it is a very good game.  The hole thing is  you have to pike pocket people and kill them you have to protect your self. I am up to the part ware you have to steal form some man. But i  am stuck at that part. How do you pike pocket? What button do you press a b x y rt lt it is complicated game. should i start the game over.