Here is the jacket I am sewing for my Casual Workplace Wardrobe SWAP. I am using Vogue 7978 (view A). It is interfaced along the hems, both front pieces, the collar and sleeve cap. For lack of a better idea, I followed the Vogue instructions, which has me sewing the collar on the bodice and the undercollar on the facing pieces. Then you just sew the front to the facing.
At this point, it's just pinned together to see if all the pieces fit. But, I read on Stitchers Guild that the experienced sewists don't follow these steps. Ann Rowley mentioned she likes to construct the collar first, then assemble bodice & facings. That way she can steam and shape the collar better. Sure makes sense to me! So I will figure out a way to steam and shape the collar before sewing. Next time I'll remember that the Vogue instructions are often less than ideal.
Fortunately, my sewing helper did her job. She feels that pre-warmed fusible interfacing provides superior adhesion. Naturally, I appreciate her hard work to ensure that all of my interfacings were pre-warmed. :)