Maiden flights and the first few after are always a time of high anxiety and excess adrenaline for me...less so the first few flights of the season. There have been some great suggestions to lowering the stress level posted before and I will echo some of them for sure.

Preparation, Planning, and Practice are essential to the success of any endeavor:
Prep...Build your plane well and check it out thouroughly before ever taking it to the field...have a checklist and use it in your final preparations ie,)
CG slightly forward for maiden (and where have others found the sweetspot on the same a/c), control surfaces secure and clevises locked, servos secure and arms all have the screw in them, push rods secure, all wiring secure and battery checked out (not just charged) etc. etc. do it before you leave the house. Knowing the a/c is ready without having to second guess helps alot-lets you think about you and not the plane.

Plan...know what you're going to do before you even crank, especially on maidens. Develop a maiden checkflight list and use it. Fly the plane out on the first take-off and don't let the adrenaline get the best of you for the worst outcome. don't just yank it into the air when your t/o roll goes awry-no one is impressed that you got into the air at a right angle to the runway in a 45* bank and 45* upline right over the pits. More respect is given when you know when to cut the throttle and try it again from start-you'll save many an a/c as well. Don't get cocky with it on the first outing just because it feels right. Thourough post flight first few times out-I use the same as my post build/pre-maiden list. At the field is great, someone else may see someting you miss but, Do it at home as well so you can concentrate.

Practice...This never ends, even when your plan is to take "ol' trusty" up and let loose! In other words fly and fly often! Simulator is great for keeping co-ordination through the off time and to get comfortable with new/complex manuevers or routines before comitting a real plane to it. First of the season I always take out the trainer...2 reasons- 1.) check it out for the kids or newbee friends after the off season in prep for the new, 2.) no stress first time out of the new season. then move throught he inventory going from the easiest to the squirreliest.

Been flying 20+ years and still like to have a "cobber" or trusted fellow accomplished 'buddy' at my side at any time, but particularly at maidens. No amount of stubborn pride can replace the time spent on a really nice plane. An extra set of eyes and ears can be very beneficial at spotting or hearing a potential problem before it gets too big as well...It's also nice to have a personal friend to slap you on the back with an understanding "that really sucks, man!!" if something does go tragically wrong.

I'm a strong believer in check lists and flights devoted to practicing one particular manuever with a specific plane. (must be the military aviation background). Doing repeated "precision oriented" t/o's and landings to a full stop, not just touch and goes, can do wonders for your confidence level all 'round....and spice it up a bit, set personal goals for it ie) centerline 'made' all the way out +/-18", perfect rectangle pattern, landing 1st 3rd of the field, lined up and on center, maintain center on roll out. (now do it rudder,elev,thrtl only-or simulated 'dead-stick' when a buddy calls it randomly through the flight routine) work a mental checklist through out and then use the practice to make every t/o and landing look like that. Once that gets really nice the rest just seems to fall into place.