Being fairly new to the game, but with significant coaching experience, I would suggest a couple things. First, there are many "styles," but there are many fundamenals. In other words, there ar some "wrong" techniques that can and should be corrected. Videos ar good for that. Coaches teaches and friends are good.
Second, repatition of good fundementals is imporant. That is good practice. Foot work, stance, follow through and other fundementals are important and common to all sports. The more you work on them, the better you will get. That will also improve confidence and remove much of the head game. I would bet that Louiseville bball teamstll does a lot of basic shooting drills. Come gametime, unique situations can be dealt with.
Also practice difficult situations. Coach K will run his offense against 6 or 7 defensive players.
Lots and lots of practice. Listen to all who are good.. try new techniques. Use what works and what works for you.
Just some thoughts.