I use painter's tape to tape my backing down to the table (usually go to our community center and push 2 together). Work from opposite sides and pull taut, but try not to stretch. Then I lay the batting out. Once it's where I want it, I fold it back 1/2 way and spray the batting in a grid pattern about 6-8" apart. I do a couple of feet at a time. Then fold that back over the backing and smooth. I keep doing that until the first 1/2 is done, then do the other 1/2 the same. If I need to match the center front to the back, I put pins to mark my spot. Then I put the top on, center it. Fold it back and spray the batting same as I did before. Because it gets a lot of handling before/between chances to quilt, I usually pin the outside edges every couple of feet.
Some spray the fabric. I never tried that, I was taught to spray the batting. I don't know if it makes a difference or not.