Marti Michell is the one who teaches quilting in sections. She has a really neat method of dividing the quilt into sections that are manageable to quilt. She has a book called Machine Quilting in Sections, and also a Craftsy class of the same name. You can preview the craftsy class free, and decide if you want to subscribe to Craftsy to see the rest of it. ($7.99 a month but they sometimes have free weekends and/or specials.)
https://www.craftsy.com/class/machin...or-any-quilt/#