The more important thing is to start from a place where you truly don't give a fudge what ANYONE thinks of you (outside of your boss and the law, obviously) IME, even though I had heard that advice many times in the PUA community, I did not INTERNALIZE it until experiencing the worst kinds of failure, improving, and seeing all the haters I had accrued.
There are two steps to it:
1) Believing in yourself.
2) Being devoted to perfecting a method and getting consistent results.
The problem with PUA is a lot of guys end up being content with number 1 and they stop growing. At that point it stops being confidence and turns into self-deception. Never seek anyone's approval or attention, but do work on social skills, charisma, and exuding sexuality. Some people think "not caring what other people think of you" equals purposely being an ******* for no reason .. that's just the other side of the coin because you are still trying to force the outcome ... and surprise, surprise, most people with an ounce of common sense will just perceive you as an idiot (generally not conducive to getting what you want).