It works to an extent. But.. i've heard all of these quick 1 step solutions to fixing a major problem.
Fake it till you make it, imagine people in their underwear if you're speaking in front of a group, etc.
This isn't merely being nervous that you'll sound stupid, this is anxiety and the steps to fix it are long and complicated. Medication, better cardiovascular and mental health, better overall social cognitive awareness, etc.
The fear in my opinion for people with aspergers, is that there's a huge blank gap in basic knowledge towards socializing and interaction that we know nothing about.
So once we enter into the process of putting ourselves in a situation that causes discomfort, the anxiety can hit us like a truck.
Everything that we tried before doesn't work as well as we wanted it to or we wouldn't post here. That being said it works to an extent, but these people giving the advice don't actually know what you go through in the first place.