A lotta skill, a little luck too. The most a person can do is put themselves in positions that they feel give them the best chance of killing a big buck. Location is important, but it doesn’t make getting one a given. The more you put yourself in that position the better your odds. Many factors go into putting yourself into those positions, time available to scout & hunt, skill at reading the sign you find, persistence to find land that holds big bucks(or to find that one buck on the land available to you) and composure to make the shot when it comes. Dumb luck can fall into place on any individual encounter, but the more encounters you have, the better the odds that one will be favorable.