Hi there!
I'm new to this board and even though I haven't formally introduced myself, I wanted to chime in on this post!
I bought Dr Ruf's book when the term "gifted" was brought to my attention a couple months ago in regards to my DD ( now 3yos, 3mos). It did answer a lot of questions! It helped me evaluate where I think my dd is at in terms of Ruf's levels of giftedness.
Another great book I found helpful is James T Webb's "A Parent's Guide to Gifted Children". This REALLY answered questions too. Example- I wondered why my dd didn't "stick out" but I believe it's because she is in the 125-140 IQ range - bright enough to whiz through school and a job but not bright enough to stand out. Webb's book pointed that out to me. Which actually correlates with the level I am comfortable at putting my dd at - a lower level 2.
I would recommend those books to you as well. My dd isn't old enough to test but it does give me a direction with her.
My only "hang up" right now is believing that ALL children aren't like this as it's so normal to me!!