Lots of good advice already noted in the thread OP. Repetition helps, so fly as much as you can. Use a sim if available. Fly with a buddy, perhaps someone you trust, just to stand next to you and give you moral support, if nothing else. I used to maiden planes by myself in case I crashed, didn't want others to see. Now I will only maiden if I can have some of the guys around I really trust. Not the ones that just say go up, let her rip, but the ones who will tell me NOT to fly if everything isn't perfect. They know me better than I do sometimes, I'm impatient. It's saved me more than once in making silly errors (reversed throws, no wingtube in a glider). Although I think your question was more of a mental thing, I also found dialing a little expo in when I'm nervous helps out a bit. The sticks don't seem to be as responsive when my fingers are jumping around.

Good luck