Rita, what I do is lay out my backing, lay out my batting on top,fold the batting in half then in half the other direction. Spray batting with basting spray one section at a time. Then I lay out my quilt top and fold it also. check that there is enough backing hanging over all around before folding top. Set the top aside.
Spray the batting in first section, lay down the top and smooth the first section.
Spray section by section and unroll the top. I usually pin the edges then flip over and make sure there are no bumps, lumps,or wrinkles.
The product I really like is iron on fusible batting. After quilting, wash and it is very soft. I find this product stay stuck down much better.