Kung fu is hard work. Wing Chun cannot be learned in six months - form alone will not teach you Wing Chun. One of Wing Chun's greatest exercises is chi sao (sticky hands) and it must be done with another opponent. Chi sao will teach you how to "feel" the opponent's movement and its a gradual climb. There's definitely a difference performing chi sao against a master and against a student. There are other nuances that a master must observe in and teach the student. Structure is very important in Wing Chun because without it you'll be an ineffective fighter. Many masters focus on particular parts of Wing Chun and have been considered experts at them. Wong Long is the master of bong sao, Bruce Lee is the master of trapping hands/bridge (I don't remember), and Ip Man was the master of shifting (it was said he never backed up during a bout). It takes serious study and time to become known for specific parts of Wing Chun. Lineage is considered very important in Wing Chun as well. Unfortunately, Wing Chun is one of the martial arts that a lot of people gravitate to because of the media and Bruce Lee's notoriety which in effect means that there will be people who will exploit people's eagerness to follow in Bruce's steps or people who are genuinely curious about Wing Chun as a martial arts.