I have no dog in the hunt. I have the EAA Package
Just a question. If the OP has the airplane assembled and ready for first flight at that airport, what are his options?
Here's my $0.02...
Verify 100% that the control systems, engine, and prop function properly. Have several other mechanically inclined airplane owners/maintainers look at things.
Select an appropriate ground crew. Radio guy, phone guy, extinguisher guy, medic guy, car/chase guy, etc.
Brief yourself and your crew properly. "If this happens, I will do that. Your role will be..." Know the emergency landing opportunities in your vicinity. Know what your flight plan is and advise the ground crew. Probably a 30 minute flight climbing to 3-5,000' above the field testing flight characteristics, handling, and engine performance, plus a brief slow flight trial so you have an idea of your landing speed with flaps down. Know what constitutes an abort situation and what you'll do in that situation.
Pick an appropriate day. Choose your runway based on wind and emergency landing options.
Good preflight, good runup, controls free and clear, off you go. Don't be afraid to abort before liftoff if anything is amiss. After liftoff, you're probably committed, so climb at VY to at least 500', then maybe shallow the climb for cooling. If something is wonky, land immediately. Otherwise fly your initial flight plan.
For the most part, ignore all but the most dire engine warnings until you're on downwind. Even better, set your "idiot light" annunciators to "loose" limits, like 450 CHT, 240F oil, 50 lbs of oil pressure, etc. so those annunciators only bother you in serious circumstances. Don't (for instance) set a 400F CHT warning because you want <400F CHT's. You're likely to hit that limit and trigger lights and warnings that will distract you.
A good plan might include landing the airplane at a field with a longer runway and completing phase 1 (or at least most of it) from the longer runway.