Over 15 years of flying, and I do get the nerves and anxieties rolling from time to time. But admittedly I feed off of it, the more nervous I am, the more I know I will be on my A game. Flying the powered planes gives you a couple of outs so to speak, I also fly some really mean Power Slope Scale gliders, from a 210 foot sheer cliff. There is no aborting the take off, there is usually one shot at the landing once you commit to my particular flying spot here at Pt Fermin in San Pedro CA. The pacific ocean will gobble up your plane if you find flying out of the lift too long your cup of tea, the cliff line will reach up and smack you down due to the turbulances associated with the different gullies, bolders and vegetation, and lastly, you fellow "friends" and co-flyers, will always coax you into a manuever that send your high speed pride, nose over tail, hitting every nasty bump from top to bottom.
The speed aspect of the turbines, all turns relative after a couple of initiation hops. I also say, being nervous is aok, gives a bit of satisfaction, other wise we would all stick to high wing, flat bottom under powered trainers, eh!?

Ray