I'm also an X-TP user. I came over a month ago to the Evo, with the same HW and SW versions as you have. It is a change, that's for sure. It took me a lot of reading and re-reading the root thread over at XDA since the android terminology is so different than WinMo. But I got it done within the first couple of days. I wanted it done immediately so I could tether to my laptop as a modem. You can't do that without paying Sprint otherwise. And it works beautifully.
Anyway,
here's a link to a post inside that XDA thread that may help. It's a more detailed step by step to complete the rooting. So same deal as the first post in that thread, just has more detail about how to do and where to get things. I wish that had been up before I rooted mine!