I was deeply in GT denial about my whole family until the girls were tested. I think an evaluation from a professional can really help a GT denial person put things in perspective.
I highly support the eval.

I wouldn't put too much weight in the teacher's comment. I've found that most teachers think of gifted children as those who fall into the moderately gifted range. HG and plus are a whole different ball of wax. Most teachers don't have clue.
It's hard to describe what a yellow bellied sneetch looks like if you've never actually seen one. KWIM