Concert Preparation and Performance Technique
This is a small and a big subject, like layers in an ice cake.
The "platter" first
We want to do our best. Play well.
Performance Technique Thoughts
This is very important. Means "Now". Think of the first note; do not bother about the rest.
Try to hear the note. The more you can think of the present, then you can become a musician. You can learn about timing. When playing Haydn, listen to the intro played by the orchestra. When I played my first Hummel in Japan, the orchestra started, but I kept thinking, "What is the first note?" After that experience (of negative thinking), I wrote an article in Yamaha Magazine about this.
A last thing about "present time": When you can focus on the music, you can get great phrases and flowing. I've watched famous players make mistakes, but they "reached them" (the audience).
Read the "Inner Game" books (by Timothy Gallway and others - The Inner Game of Music, The Inner Game of Tennis, etc.).
When you feel nervous, don't fight it. Realize it is common. "Butterflies" means you are ready to play
The more you practice the better. Don't be afraid of challenging yourself. Better to be "supple" than beating yourself.
Remember practice is different from concert. You don't take 27 bars rest in the practice room.
A balance of rest and playing is good. Several short times are better than a long one.
Focusing on the whole piece - playing through it without playing. Like skiers who prepare for going downhill. But remember in music more emotion, not raw adrenaline like in sport.
"This is me - how I feel". Get away from it also.