wow, catherine, you went through your stages much earlier than I did. But I think you've got them pegged. We started our "phases of GT acceptance" after we got DS4's test results (PG based on the chart Cathy posted). We had him tested as a condition for early entrance into kindergarten. We went with the psych's recommendation to not early entrance DS. Your "worry/anxiety" wa much more like panic for me. I'll add "find out everything I can about HG" as a step before planning.
Here's DS4's background. Alert at birth, and with strong neck muscles. Day 2, flipped himself over in the bilirubin light incubator thingy. Besides that one incident, he was early at rolling both ways. After that, not too early with gross motor. In fact, he took first several steps before he turned 1, then fell, then didn't try again until 14 months and kept on since then.
He didn't jump until about 3 1/2 - he's my cautious little kid (except for his invincibility syndrome).
Very early talker. Can't remember exactly when. I do remember that before one I had some sign language cards. I remember looking at them, in a very lazy manner, and thinking, well, he already says or understands all these words, why should I bother with the signing?
Could sight read many words around 2. Around 2.5, took off with road signs. I ordered tana hoban's "i read signs" then, and by the time it arrived, he could read it straight through by himself (he was very proud to have "read" his first book.) He could read chapters in Frog and Toad around his 3rd birthday. After that, we knew he could read many words, but he didn't want to read to us.
I forgot to mention that he has always loved being read to, since birth he would pay attention to books. We have pictures of interested baby on his back with daddy laying next to him reading hop on pop. Reading to him was one of my calming techniques for high maintenance baby. Horrible napper. He wanted to be read to for hours when he was old enough to point at books (early pointer too - I remember carrying him around identifying everything he pointed to).
Now, at 4.5, he's reading encyclopedia brown chapters to us (he'll only read to us as a procrastination method at bedtime). These are maybe 3rd-4th grade level? He's not interested in spelling too much or writing.
He occasionally shows some interest in math, but always loves science stuff. We just try to play with him like anyone else, though. He loves hiking and collecting rocks. He's still just a kid. We'll worry about "real" schooling next year (although we definitely continue teaching him on a day to day basis - just not organized teaching).
sorry so long!