I worked the first vest all the way to the waist, then tried it on Justice to see what needed tweaking. I ended up frogging it all the way to the armscye, eliminating the underarm increases, and now I'm creeping slowly along to the waist, improvising the central decreases and making notes so I can replicate this on the second half of the vest.
I'm still having fun. I'm definitely learning a lot. And I'm heading back to my knitting now.