It really has less to do with how many planes you've flown and how the plane you want to test fly compares to what you've flown before.

If you've flown planes that at least as tricky to fly as the Uproar (and it sounds like you have), and you are confident that you set the plane up correctly, then you can handle it.

Also, a lot of guys don't maiden their own planes just for nerves.

It also pays to talk to someone who'd done a lot of test flights to see what they do and why. When I test fly a plane, I have specific things in mind that I want to do and things I want to avoid doing. Most of it is common sense, but it never hurts to go over it in your mind before the flight. Some pointers (at the risk of being obvious):

- Have a spotter/helper stand next to you. Get the full sky if you can.
- If the landing gear set up is new to you, a fast taxi or two isn't a bad idea. But I've seen guys spend all day running up and down the runway, which may or may not be a good thing for you.
- Make sure the engine is well broken in and reliable. A deadstick on takeoff of a brand new plane is often fatal since you have no idea what the glide "feels like".
- Get altitude first after take off. Lots of it.
- Throttle back as soon as you have altitude. Fly fast enough to be well above stall, but the slower you fly, the more time you have to figure things out. (I've seen crashes where the guy never backed off the throttle, and never had time to get ahead of a badly out of trim plane)
- Trim levers, get the plane flying hands-off straight and level. If you need to re-program the radio in the air because you are out of trim, you fly, and get your helper to program. You can land out-of-trim, but it's harder than in-air programming on most radios. But it's a judgement call here, some people will tell you never to reprogram in the air.
- As soon as you are trimmed, try out low speed flight and do some missed approaches. You'll want to land eventually, do don't get caught up trying acrobatics and end up doing your first low speed flight on a deadstick because you are out of fuel or something.
- If you have time and everything is going well, I like to do a straight ahead stall just to see what the plane will do, again because you have to land it some time, so the more you know about how it handles for landing the better off you are.

Have fun. Personally, I love test flights.