oh yeah, every time or at least usually you step outside of your comfort zone there is a that feeling of nervousness but imo thats what causes most crashes.
I try to stay as calm as possible and these days almost talk myself through laps (and i mean actually talk to myself inside of my head while riding).. brake here, turn at this point, pick the throttle up here.. ok that felt good can i pick the throttle up in this turn 1m earlier? etc..
once you brake it down it helps to take control of the anxiety for me... i also always have an escape plan.. if i am going to try and get on the anchors later, i run through the scenario in my head "ok if i cant pull it up, stand it back up brake try to turn or run off there and get on the rear brake on the grass" etc.. that sort of thing. it helps me to be prepared and expect a reaction to a mistake. mind you, i push in increments so i have only ran off the track once in 10 years (not counting crashes). there is no point braking 15m later.. try 2-3m each time. besides the real trick i have found from watching the fast guys.. brake at the same point just brake LESS! it keeps the bike poised and sets u up for higher entry speed!
dont know if any of that makes sense. i think certain times you can do without really knowing why of how.. i reckon it was about 44's for me at EC.. i just did it, felt like i was going to die, but still got around. didnt really think about much other than jamming the brakes at the last second and pinning the throttle as hard as i could.
i felt more in control and safer doing the 38/39's now because i feel like i have broken down the track in my head any my riding to understand when and when i have to do to get that time.