Welcome, galun!
Here are some further thoughts on whether to test -
Testing your gifted child: a springboard to advocacy (Duke TIP, August 2006).
A good starting place for finding a tester is
Hoagies Gifted Education Page, which includes a webpage listing
Testers.
For information on testing, see this
old post from a thread whose subject is
What do you tell your DC before IQ testing? Other posts on this topic include
this one from a thread whose subject is
Help! What do I tell him about the testing? You'll find a collection of advocacy resources and threads
here.