I took a class for making minkee blankets and other things.
For the blanket, we laid out the back and marked the border, and center line. Then we used basting spray - lightly - you don't need much. The top was strips of different patterns and we spray basted the first strip, starting in the center, then built off of that strip. once the strips were sewn down we lightly spray basted the border area and flipped it to the center, turned under the edge and ziz zagged all the way around - pinning helps a great deal and mitering the corners is easy. nothing else is needed = Good luck - PM me if you need more information.