Whisky.
If you do mess up, you don't care.
Fats waller used to use it a lot.
lol

I used to get SO nervous (and like RIGHT before the performance it'd hit me), then suddenly something happened, yesterday in fact!
I randomly decided I'd intrude on a university student, lol, and after explaining myself to her, she invited me into her practice room and had me sight read Brahms' 1st violin/piano sonata together with her, lol.
Yeah totally random.

Well, right after that and some talking, she had me play whatever I wanted (which of course was my old Haydn sonata Hob:xvi:59 (yes, once again, I know.. lol), random part of a Chopin Ballad 1 (which she told me to do for auditions, despite its popularity?! lol), and first page (for it was all I remembered) of Polonaise Op.26/2), and it's like for some reason I lost my nervousness as soon as I sat down.
I sort of forgot myself and everyone else, it was a totally new experience for me. It was like I was some observer, watching my hands just.. "go," heh.
Then she gave me a free lesson! She was very awesome

So I say, also, try to forget everything sort of. I think for this finally to happen, you must also have more experience performing in public. Even though I don't really have all that much, I think it's sinking in (thank god, lol). So really, that'd be my number one rec: exposure, and "forgetting"
