I rarely follow the exact sequence of steps in a pattern. It was drummed into me by an outstanding teacher that the neckline, and any other appropriate curved bits, should be taped/stay-stitched immediately after coming off the cutting table, before any significant handling. It surprises me how many patterns tell you to to complete several other procedures (darts, shoulder seam etc) on the bodice first, and only tell you to stay stitch neckline just before working on it. By that time it has probably already stretched and the damage has been done. (Definitely never try it on until stay stitching is done!)