I borrowed a book "Stage fright" ... in music performance and its relationship to the unconscious ... by Michael I. Goode
It is very scientific and takes up 3 specific cases of musicians, different methods of avoiding stage fright and their benefits. Dont know if it is good yet... Got it today...
It looks like an easy read.
Things from my own experience:
Gradually build up your self-confidence... the easiest is to play easy pieces for about 1-2 friends, and then play more and more difficult pieces for more and more ppl.
And have a good atitude both to successes and to set-backs. A success is of course good... and when it goes bad you get more used to that situation... so you will not be as scared of it...enjoy the adrenalin kick

Its natural to mess up sometimes.
Btw, maybe its not good to suppress the nerves, but to face them?
/Jacob