I FMQ and use spray baste.
I hang my backing, pin it to the design wall, smooth real good
then pin down the sides, spray with baste, then
pin batting to top of design wall, spray about 1/3 of back side, smooth over backing, moving hands from middle of fabric out to the sides (like hanging wallpaper), the pin down side of design board, repeat to bottom of quilt,
pin top to design wall start out by spraying back side about 1/3 of the way down, smooth over batting, spray another 1/3, smooth over batting, etc. pin sides
take out side straight pins and put in a few safety pins down each side, about every 18" or so, take down from design wall and put a few safety pins in top and bottom.
The weight of the fabric and batting helps pull out wrinkles etc., and I don't have to bend over a table or get on the floor.
If you use this method be sure you put up some newspaper or something for the spray bast over spray.
Finally, when FMQ I always start in the middle and work out kind of in a circle, and check the back pretty often to make sure everything is staying in place.