Here are the instructions and the ones in bold are a bit beyond me.
With yarn threaded on a tapestry needle, sew front and back tog at side seams and sew sleeve seams. Turn facings at hem and cuffs to WS along picot row and sew into place. Sew right shoulder seam. On left shoulder, beg at top of armhole, sew shoulder seam for 1 1/4" only, leaving rem of seam open to neck. Turn neck to facing to WS along picot edge and sew into place. Sew in sleeves.
There are actually more instructions regarding the crocheting of a neck closure but I need to start with simple assembly. It just seems basic to me to sew the parts together but I have never been a seamstress (read: I’ve never made clothes from cloth) so I don’t understand “facings” or what differentiates hems and cuffs.