Thanks for the responses to my question - now I feel pretty good about this so far! I'm a fairly beginner quilter and was worried about being able to keep up or even just figure out the clues. I am pretty confident with HSTs so, while I'm sure future clues will be more challenging, at least I got this one done in a few hours over two days (I'm only doing ~2/3rds of the units). The BH Essential Triangle tool was new for me, but it really made sense and was much more efficient than my "normal" HST method (the magic 8 method held no appeal, so I didn't try it).
I love seeing all the different HST units everyone has made - it's amazing how different they all look despite all coming form the same "plan!"