This is all that it comes down to... and in fact, that goes for pretty much EVERYTHING in life.
You can watch all the documentaries you want, read all of the books you want, practice in front of the mirror, but you've gotta go out and PRACTICE. I can watch Stephen Curry shoot jump shots all day and he can tell me correct form and everything but I've gotta actually go out on the court and shoot myself for me to get better.
But having more knowledge/information doesn't hurt. I'm not an expert, but I do pretty well with women and I used to be extremely introverted. I studied human psychology and women's psychology a lot and that helped me from a theoretical perspective, but I didn't really build confidence and improve until I actually went out there and spit.