1. You shouldn't really have any Gaping Front and Back neckline as the sleeve will drag that area flat.
2. Start by pinning the CB at the seam line. (you'll need someone to do that for you.
3. Now take a good look at the front, side and back bodice and see if there is anything that needs to be altered.
4. Now do the Across Back Test. Pull your arms to the front to see if it feels too tight, OK or just right.
I'm happy with mine even though it is slightly tight.
This is what I'll do for my Toile above:
And that's it. Super simple compared to Module 1.