It is suggested to those that experience anxiety

That doesn't work. I tried it when I had to give a speech to a bunch of college girls. Not only was I still nervous,but I was nervous [i]and[/i] I was pitching a huge tent :( very embarrassing.

Never worked for me... I just look through people and they think I'm looking at someone behind them.

This is sadly not true at all. Just look over people's heads when you talk

Not at all
I find the best tool is to pick out one or two faces and imagine you are just talking to them.

I have never done this but I'm pretty sure that would not be effective. Not at all!