I am a lower eschelon pro in my area. I have my niche and play with a bebop quintet, a 70's style rock horn band, and do a good bit of church music in brass ensembles. I just got a call to do a recording session with some of the big dogs in the area. I took the job, but I know what will happen. I will get up tight, which will affect my ability to concentrate. I'll make a silly mistake somewhere, and then worrying about that mistake will cause others. I know I should relax and attack the job with some confidence. I'm a good player and capable of handling the part. But how do you relax and focus when the pressure is on?