I think you can go either way before putting on the edges. You might want to weave the ends in first, so they don't get in the way of picking up the stitches for the collar and arms, but otherwise I don't think it matters. You should weave them in before blocking, though, I believe.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry