Go for it!!
Hey, I say GO FOR IT!!!!!!
All of us who advise beginners to get an instructor have no idea what we're talking about. We never actually needed an instructor either. We just did it to appease the old farts.
If you go ahead and fly the plane on your own; whats the worst thing that could happen?
You might get lucky and get it off the runway without breaking it or running it into someone. Then if you get it off the runway, it will surely fly straight and level and just climb gently to altitude without throwing you any curveballs, right? What are the chances that you might have the ailerons reversed, or the elevator reversed? Heck, I'll even bet a weeks pay that you'll have the balance perfect!!!!!!
Go for it buddy!!!!!!! YAAAAHHHHHOOOOO
It only costs about $500 to build a plane. You've got deep pockets and if you happen, by some unforseen reason, to crash it; just go get a new one, right? No problem.
I'll bet you can even land the sucker on your first attempt. After all, you do have extensive flight simulator experience. And any idiot knows that a simulator is "Just like the real thing". Flying a simulator has probably made you an expert pilot already, and you haven't even flown a real plane yet. Flying a real RC plane isn't all that different than a simulator. Just go for it!!!!!!!!!!
You might want to take a few pictures of your plane BEFORE you head out to the runway. Just in case something bad happens, and God forbid, you wind up taking the plane home in a trashbag.
Good luck. Heh heh.