What exactly psychological approaches should I adopt to analyze Henry James The Turn of the Screw?

Question

I am supposed to run an analysis on the whole story but from a psychological perspective, so what do you recommend me to do?

Answer 1

I'd advise you to read up on scholarly analyses of the story that take a psychological approach. There have been many in the wake of Edmund Wilson's 1934 essay "The Ambiguity of Henry James".
Some are listed here:
http://www.turnofthescrew.com/ch3.htm