In the end, Eggsy stops Valentine's schemes before any significant damage is done to the world's population. However, Eggsy would not have been able to do that had he not buckled down and made the transformation from a chav to a debonair secret agent in the vein of James Bond. When the movie first starts out, Eggsy is anything but a slick-talking spy. He's a heavily-accented punk who steals cars just for a good time. In fact, he only gets the opportunity to become a Kingsman when he uses the number on his father's old war medallion to call Harry for a get-out-of-jail-free card. Most of the rest of the movie actually focuses on Eggsy's training instead of his world-saving escapades. He learns how to fight, shoot, train dogs, mix drinks, and practically any other skill one would expect a spy to know off the cuff.
In the end, that's what the movie is really about, becoming a hero. Eggsy doesn't directly engage the antagonist until the beginning of the third act. Even then, that's only because Harry Hart is removed from the picture by the swift urgings of a bullet to the head. When Eggsy learns that every other Kingsman is actually on Valentine's side, Eggsy has no choice but to save the world. It's a character development that is equally the result of circumstance as it is Eggsy's morals.
