Welcome to the forum.
Very good suggestions, and prep is key too.Welcome to B&B!
1- I wouldn't worry about BBS shaves, they'll happen eventually. Even if they don't it's not a big deal. A DFS works for me, if it happens to be BBS, great! But comfort is more important, IMO.
2 - Blade buffing and skin stretching helped me with the jawline. Shaving a flat surface is much easier.
I'm following Geofatboy's method of shaving (the neck) north to south on the first pass, then south to north on the second. It's that bony part of the jaw I'm having difficulty with. Any pointers would be appreciated.
Edwin Jagger DE89