Nerves? I just finished building a plane from a kit. 18 months of work! I was nervous about the maiden but worked through it. Took the plane off and it was a bear! Wanted to do nothing BUT stall! Got it back on the ground, took a day to repair a couple cracks in the cowl, readjust the CG (NOT according to the manufacturers specs that were WAY off!) and get a new prop. 24 hours later I was standing at the fields edge, engine running and hands shaking...ready to try it again!
I've been doin' this for over 10 years and still get the shakes. But there is no feeling better than when it all comes together and your big ol' ME 109 comes rippin' down the runway on a full throttle flyby, you tip the wings slightly and get a full view of the top side as it screams by...it's worth every nerve racking minute!