I took a class last year from Jan Krentz, called Colorwash Hunter Star. We used a fusible 1" grid foundation for a small wallhanging. I enjoyed the class, but I didn't enjoy the technique enough to do it again. If you're unsure whether you want to use that technique, you might try a small project first.
One tool I learned about in that class was the StripStick, which is invaluable if you're ironing the seams in a 1" grid. I bought them in several sizes and have found them helpful when ironing any seams, open or closed.
http://www.thestripstick.com/