I agree with all the above posts... an instructor on a buddy box is the only way to go. I just took one of my friends for his first flight. He nearly ditched it a few times and would've had I not been there. Isn't it worth all your assembly effort and the couple hundred bucks you put into the plane to get an instructor or at least an experienced pilot with a buddy box?

And I completely agree that you should always... I mean ALWAYS have an experienced pilot take your plane up for the first time to trim it out. I have seem some planes that cannot fly true even with full aileron trim deflected (kept rolling)... try landing that beast!!! I guarantee that if he crashed it, you can at least go pick up the pieces, if a beginner crashed it, they probably need to go home to pick up the vacuum cleaner